Add all Alfred's units and answer keys

docs/alfreds-essentials-of-music-theory/book-1/unit-1/unit-1.mdx

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+import Details from '@theme/Details';
+import Unit1AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 1.pdf';
+
+# Unit 1
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit1AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-1/unit-2/unit-2.mdx

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+import Details from '@theme/Details';
+import Unit2AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 2.pdf';
+
+# Unit 2
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit2AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-1/unit-3/unit-3.mdx

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+import Details from '@theme/Details';
+import Unit3AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 3.pdf';
+
+# Unit 3
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit3AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-1/unit-4/unit-4.mdx

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+import Details from '@theme/Details';
+import Unit4AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 4.pdf';
+
+# Unit 3
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit4AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-1/unit-5/unit-5.mdx

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+import Details from '@theme/Details';
+import Unit5AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 5.pdf';
+
+# Unit 5
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit5AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-1/unit-6/unit-6.mdx

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+import Details from '@theme/Details';
+import Unit6AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 6.pdf';
+
+# Unit 6
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit6AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-2/unit-10/unit-10.mdx

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+import Details from '@theme/Details';
+import Unit10AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 10.pdf';
+
+# Unit 10
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit10AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-2/unit-11/unit-11.mdx

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+import Details from '@theme/Details';
+import Unit11AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 11.pdf';
+
+# Unit 11
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit11AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-2/unit-12/unit-12.mdx

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+import Details from '@theme/Details';
+import Unit12AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 12.pdf';
+
+# Unit 12
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit12AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-2/unit-7/unit-7.mdx

@@ -1,4 +1,5 @@
 import Details from '@theme/Details';
+import Unit7AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 7.pdf';
 
 # Unit 7
 
@@ -22,6 +23,10 @@ import Details from '@theme/Details';
 | Key Signatures – The Sharp Keys   | 46    |
 | Key Signatures – The Flat Keys    | 47    |
 
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit7AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>
+
 ## Practice
 
 ### musictheory.net

docs/alfreds-essentials-of-music-theory/book-2/unit-8/unit-8.mdx

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+import Details from '@theme/Details';
+import Unit8AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 8.pdf';
+
+# Unit 8
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit8AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-2/unit-9/unit-9.mdx

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+import Details from '@theme/Details';
+import Unit9AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 9.pdf';
+
+# Unit 9
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit9AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-3/unit-13/unit-13.mdx

@@ -1,4 +1,5 @@
 import Details from '@theme/Details';
+import Unit13AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 13.pdf';
 
 # Unit 13
 
@@ -19,5 +20,8 @@ import Details from '@theme/Details';
 | 54        | Figured Bass                              | 86    |
 | 55        | Major Chord Progressions                  | 87    |
 
-{/* ## Practice */}
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit13AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>
 
+{/* ## Practice */}

docs/alfreds-essentials-of-music-theory/book-3/unit-14/unit-14.mdx

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+import Details from '@theme/Details';
+import Unit14AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 14.pdf';
+
+# Unit 14
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit14AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-3/unit-15/unit-15.mdx

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+import Details from '@theme/Details';
+import Unit15AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 15.pdf';
+
+# Unit 15
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit15AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-3/unit-16/unit-16.mdx

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+import Details from '@theme/Details';
+import Unit16AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 16.pdf';
+
+# Unit 16
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit16AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-3/unit-17/unit-17.mdx

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+import Details from '@theme/Details';
+import Unit17AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 17.pdf';
+
+# Unit 17
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit17AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>

docs/alfreds-essentials-of-music-theory/book-3/unit-18/unit-18.mdx

@@ -0,0 +1,12 @@
+import Details from '@theme/Details';
+import Unit18AnswerKey from '../../../assets/doc/alfreds-music-theory/Unit 18.pdf';
+
+# Unit 3
+
+## Resources
+
+### Book Topics
+
+<Details summary="Answer Key">
+  <object type="application/pdf" data={Unit18AnswerKey} style={{width: '100%', height: '75vh'}}></object>
+</Details>