add Abfall_IO ics source (#1958)

* add Abfall_IO ics source

* Zollernalbkreis stopped working use abfall_io_ics now

---------

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

doc/ics/abfall_io_ics.md

@@ -0,0 +1,25 @@
+# Abfall IO ICS Version
+
+Abfall IO ICS Version is supported by the generic [ICS](/doc/source/ics.md) source. For all available configuration options, please refer to the source description.
+
+Support for multiple service provider using the AbfallPlus API.
+
+## How to get the configuration arguments
+
+- Goto your regions collection dates form.
+- Select you location and your desired waste types.
+- Right click -> copy link address of the `ICS` button.
+- Replace the `url` in the example configuration with this link.
+- Replace the year in the URL with `{%Y}` (`...timeperiod=20240101-20241231` -> `...timeperiod={%Y}0101-{%Y}1231`).
+
+## Examples
+
+### Göppingen
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: ics
+      args:
+        url: https://api.abfall.io/?key=f35bd08b1d18d9c81fcdee75dbcce5d3&mode=export&idhousenumber=2859&wastetypes=20,17,59,18,19,60&timeperiod={%Y}0101-{%Y}1231&showinactive=false&type=ics
+```