Add support for Merton, UK

doc/source/merton_gov_uk.md

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+# London Borough of Merton
+
+Support for schedules provided by the [London Borough of Merton](https://merton.gov.uk), serving Merton, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: merton_gov_uk
+      args:
+        property: PROPERTY_ID
+```
+
+### Configuration Variables
+
+**property**<br>
+_(string) (required)_
+
+Unique number the London Borough of Merton uses to identify your property.
+
+#### How to find your `PROPERTY_ID`
+
+Serach for your waste collection schedule at (https://myneighbourhood.merton.gov.uk/Wasteservices/WasteServicesSearch.aspx). Your `PROPERTY_ID` is the set of numbers at the end of the url when your schedule is being displayed.
+
+For example: myneighbourhood.merton.gov.uk/Wasteservices/WasteServices.aspx?ID=`28166109`
+
+_Note:_ You can ignore the `Address` parameter, it's optional.
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: merton_gov_uk
+      args:
+        property: 28166109
+```