adding glasgow_gov_uk

doc/source/glasgow_gov_uk.md

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+# Glasgow City Council
+
+Support for schedules provided by [Glasgow City Council](https://www.glasgow.gov.uk/forms/refuseandrecyclingcalendar/AddressSearch.aspx), serving the
+city of Glasgow, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: glasgow_gov_uk
+      args:
+        uprn: UPRN_CODE
+```
+
+### Configuration Variables
+
+**uprn**  
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: glasgow_gov_uk
+      args:
+        uprn: "906700099060"
+```
+
+## How to get the uprn argument above
+
+The UPRN code can be found by entering your postcode or address on the
+[Glasgow City Council Bin Collections page
+](https://www.glasgow.gov.uk/forms/refuseandrecyclingcalendar/AddressSearch.aspx).  When on the address list click the 'select' link for your address then on the calendar page look in the browser address bar for your UPRN code e.g. https://www.glasgow.gov.uk/forms/refuseandrecyclingcalendar/CollectionsCalendar.aspx?UPRN=YOURUPRNSHOWNHERE.