added swansea_gov_uk source (#1527)

* added swansea_gov_uk source

* refactoring/reformatting

---------

Co-authored-by: 5ila5 <5ila5@users.noreply.github.com>

doc/source/swansea_gov_uk.md

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+# Swansea Council
+
+Support for schedules provided by [Swansea Council](https://swansea.gov.uk/), UK.
+
+If collection data is available for the address provided, it will return household and recycling waste collection dates.
+
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: swansea_gov_uk
+      args:
+        street_name: STREET_NAME
+        post_code: POST_CODE
+```
+
+### Configuration Variables
+
+**street_name** _(string) (required)_ : Any part of the road/street name
+**post_code** _(string) (required)_ : Full postcode of the property
+
+## Example:
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: swansea_gov_uk
+      args:
+        street_name: "cwmdonkin"
+        post_code: "SA20RA"
+```
+
+## How to verify that your address works
+
+Visit [swansea.gov.uk/recyclingsearch](https://swansea.gov.uk/recyclingsearch) and search for your street name and postcode.