add source Highland, Scotland, UK

doc/source/highland_gov_uk.md

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+# Highland
+
+Support for schedules provided by [Highland](https://www.highland.gov.uk/), serving Highland, Scotland, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: highland_gov_uk
+      args:
+        record_id: RECORD ID
+        
+```
+
+### Configuration Variables
+
+**record_id**  
+*(String | Integer) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: highland_gov_uk
+      args:
+        record_id: 2004443
+        
+```
+
+## How to get the source argument
+
+Go to <https://www.highland.gov.uk/bindays> and search for your corresponding entry. The URL should look something like this: `https://www.highland.gov.uk/directory_record/2004443/allangrange_mains_road_black_isle` the number after directory_record is your record_id (here 2004443).