implemented tmbc_gov_uk

doc/source/tmbc_gov_uk.md

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+# Braintree District Council
+
+Support for schedules provided by [Tonbridge and Malling Borough Council](https://www.tmbc.gov.uk/xfp/form/167), serving Tonbridge and Malling, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: tmbc_gov_uk
+      args:
+        post_code: Post Code
+        address: Address
+```
+
+### Configuration Variables
+
+**post_code**  
+*(string) (required)*
+
+**address**  
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: tmbc_gov_uk
+      args:
+        post_code: "ME19 6NE"
+        address: "138 High Street"
+```
+
+## How to verify that your address works
+
+Visit [tmbc.gov.uk](https://www.tmbc.gov.uk/xfp/form/167) page and search for your address. The string you select as Address (only starts with is checked, so you can stop after the street) should match exactly your address parameter.