Added source for Sheffield City Council

Added source for Sheffield City Council with support for all bin types.
I never got Dev Containers working to properly test, however I have manually added this as a source to my instance of Home Assistant/HACS and tested fine.

doc/source/sheffield_gov_uk.md

@@ -0,0 +1,35 @@
+# Sheffield City Council
+
+Support for schedules provided by [Sheffield City Council](https://wasteservices.sheffield.gov.uk/).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: sheffield_gov_uk
+      args:
+        uprn: UNIQUE_PROPERTY_REFERENCE_NUMBER
+```
+
+### Configuration Variables
+
+**uprn**<br>
+*(string) (optional) (preferred method)*
+
+This is required if you do not supply any other options. Using a UPRN removes the need to do an address look up using web requests.
+
+## Example using UPRN
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: sheffield_gov_uk
+      args:
+        uprn: "100050938234"
+```
+
+## How to find your `UPRN`
+
+An easy way to find your Unique Property Reference Number (UPRN) is by going to https://www.findmyaddress.co.uk/ and entering in your address details.
+
+Otherwise you can inspect the URL on [Sheffield City Council's Waste Services](https://wasteservices.sheffield.gov.uk/) site having searched for and selected your address details. Your UPRN is the collection of digits at the end of the URL (before /calendar), for example: *https://wasteservices.sheffield.gov.uk/property/`100050938234`* or *https://wasteservices.sheffield.gov.uk/property/`100050938234`/calendar*