added rosplane dev guide overview as a landing page

docs/developer-guide/rosplane/rosplane-dev-overview.md

@@ -1 +1,20 @@
-# ROSplane Developer Guide Overview
+# ROSplane Developer Guide Overview
+
+The purpose of the this section is to provide detailed information on each of the components of ROSplane, as shown in the below figure.
+It is written with the intent that a user might know how to change each component of ROSplane, not only just how to use it.
+
+Note that the sections not part of ROSplane are not included in this section (ROSflight firmware, physical aircraft setup, etc.).
+
+
+| ![Diagram of ROSplane architecture](../../assets/ROSplane-overview.svg "ROSplane architecture") |
+|:--:|
+|*Diagram of the ROSplane architecture*|
+
+Each of these components are described in detail in this section, but the implementation is not fully described.
+Please refer to the code for more detailed information on the actual implementation of each of the elements shown above.
+
+## Contributing to ROSplane
+
+If you create a new "module" when using ROSplane for your application, please contribute back!
+While changes won't be included in the core ROSplane stack (see [ROSflight Vision](../../index.md#our-vision)), we hope to build a repository of modules and projects that have been created by others.
+Doing this is also an effective way to share your work and help others build on it.