Add AWG Bassum / LK Diepholz (#2173)

* Create awg_bassum.md

Waste Collection configuration for AWG Bassum

* add yaml file + add instruction for current year field + rename to ..._de...

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Co-authored-by: 5ila5 <5ila5@users.noreply.github.com>

doc/ics/awg_bassum_de.md

@@ -0,0 +1,26 @@
+# AWG Bassum
+
+AWG Bassum is supported by the generic [ICS](/doc/source/ics.md) source. For all available configuration options, please refer to the source description.
+
+
+## How to get the configuration arguments
+
+- Go to <https://www.awg-bassum.de/abfuhrkalender.html>
+- Click on "Ort wählen" and choose your location
+- Type in your street address in "Ihre Straße"
+- Click on the name of your street
+- Scroll down and copy the link of "iCal herunterladen".
+- Replace the `url` in the example configuration with this link.
+- Replace the year in the URL with `{%Y}` to automatically get the current year.
+
+## Examples
+
+### Bassum / Alte Poststraße
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: ics
+      args:
+        url: https://www.awg-bassum.de/abfuhrkalender.html?year={%Y}&city=Bassum&street=Alte%20Poststr.&slug=Alte%20Poststr.------Bassum--27211--Bassum&ical=1
+```