add highpeak_gov_uk

doc/source/highpeak_gov_uk.md

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+# High Peak Borough Council
+
+Support for schedules provided by [High Peak Borough Council](https://www.highpeak.gov.uk/), serving High Peak Borough, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: highpeak_gov_uk
+      args:
+        postcode: POSTCODE
+        uprn: "UPRN"
+        
+```
+
+### Configuration Variables
+
+**postcode**  
+*(String) (required)*
+**uprn**  
+*(String | Integer) (required)*
+
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: highpeak_gov_uk
+      args:
+        postcode: SK23 6BQ
+        uprn: "10010724045"
+        
+```
+
+## How to get the source argument
+
+Use your postcode as the `postcode` argument and your Unique Property Reference Number (UPRN) as the `uprn` argument.
+
+An easy way to discover your Unique Property Reference Number (UPRN) is by going to <https://www.findmyaddress.co.uk/> and entering in your address details.