sunderland .md added

doc/source/sunderland_gov_uk.md

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+# Sunderland City Council
+
+Support for schedules provided by [Sunderland City Council](https://www.sunderland.gov.uk/bindays), UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: sunderland_gov_uk
+      args:
+        postcode: POSTCODE
+        address: ADDRESS
+```
+
+### Configuration Variables
+
+**postcode**
+*(string) (required)*
+
+**address**
+*(string) (required)*
+
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: sunderland_gov_uk
+      args:
+        postcode: "SR4 8RJ"
+        house_number: "17 Sutherland Drive"
+```