Add Harlow, UK

doc/source/harlow_gov_uk.md

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+# Ashfield District Council
+
+Support for schedules provided by [Harlow Council](https://www.harlow.gov.uk/), serving Harlow district in Essex, UK.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: harlow_gov_uk
+      args:
+        uprn: UNIQUE_PROPERTY_REFERENCE_NUMBER
+```
+
+### Configuration Variables
+
+### Configuration Variables
+
+**uprn**<br>
+*(string) (required)*
+
+
+#### How to find your `UPRN`
+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.
+Otherwise you can inspect the web requests the Harlow Council website makes when entering in your postcode and then selecting your address.
+
+## Example
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: harlow_gov_uk
+      args:
+        uprn: 10023422690
+```