added md environmentfirst_co_uk

doc/source/environmentfirst_co_uk.md

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+# Environment First
+
+Consolidated support for schedules provided by [Eastbourne Borough Council](https://www.lewes-eastbourne.gov.uk/bins-waste-and-recycling/) and [Lewes District Council](https://www.lewes-eastbourne.gov.uk/bins-waste-and-recycling/).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: environmentfirst_co_uk
+      args:
+        uprn: UNIQUE_PROPERTY_REFERENCE_NUMBER
+        post_code: POST_CODE
+        name: HOUSE_NAME
+        number: HOUSE_NUMBER
+```
+
+### Configuration Variables
+
+**uprn**<br>
+*(string) (optional) (preferred method)*
+
+This is required if you do not supply any other options. Using a UPRN removes the need to do an address look up using web requests.
+
+**post_code**<br>
+*(string) (optional)*
+
+This is required if you do not supply a UPRN. Single space between 1st and 2nd part of postcode is optional.
+
+**number**<br>
+*(string) (optional)*
+
+This is required if you supply a Postcode and have a house number.
+
+**name**<br>
+*(string) (optional)*
+
+This is required if you supply a Postcode and you have a house name rather than a house number.
+
+## Example using UPRN
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: environmentfirst_co_uk
+      args:
+        uprn: 100060091178
+```
+
+## Example using Address lookup (Postcode and house number)
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: environmentfirst_co_uk
+      args:
+        post_code: BN228SG
+        number: 3
+```
+
+## Example using Address lookup (Postcode and house name)
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: environmentfirst_co_uk
+      args:
+        post_code: BN7 3LG
+        name: Garden Cottage
+```
+
+## How to find your `UPRN`
+
+An easy way to find 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 on the [Environment First](https://www.environmentfirst.co.uk/) having searched using your address details. Your UPRN is the collection of digits at the end of the URL, for example: *https://www.environmentfirst.co.uk/house.php?uprn=`100060091178`*