ambervalley md added

doc/source/ambervalley_gov_uk.md

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+# Amber Valley Borough Council
+
+Support for schedules provided by [Amber Valley Borough Council](https://www.ambervalley.gov.uk/rubbish-waste-and-recycling/bin-collection-dates/), UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: ambervalley_gov_uk
+      args:
+        uprn: UPRN_CODE
+```
+
+### Configuration Variables
+
+**uprn**  
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: ambervalley_gov_uk
+      args:
+        uprn: "100030011612"
+```
+
+## How to get the source argument
+
+An easy way to discover your Unique Property Reference Number (UPRN) is by going to <https://www.findmyaddress.co.uk/> and entering in your address details.