Add support for West Berkshire Council (westberks.gov.uk)

Source and documentation added.

doc/source/westberks_gov_uk.md

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+# West Berkshire Council
+
+Support for schedules provided by [West Berkshire Council](https://www.westberks.gov.uk/).
+
+If collection data is available for the address provided, it will return rubbish and recycling waste collection dates.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: westberks_gov_uk
+      args:
+        postcode: POSTCODE
+        uprn: UPRN
+```
+
+### Configuration Variables
+
+**postcode**<br>
+_(string) (optional)_
+
+**hournameornumber**<br>
+_(string) (optional)_
+
+**uprn**<br>
+_(string) (optional)_
+
+Either the postcode _and_ housenameornumber or the UPRN should be supplied in the arguments
+
+## Examples
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: westberks_gov_uk
+      args:
+        uprn: "100080241094"
+```
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: westberks_gov_uk
+      args:
+        postcode: "RG18 4QU"
+        housenameornumber: "6"
+```
+
+## How to find your UPRN
+
+An easy way to discover your Unique Property Reference Number (UPRN) is by going to [Find My Address](https://www.findmyaddress.co.uk/) and providing your address details.