add source for stadtreinigung.hamburg

doc/source/stadtreinigung_hamburg.md

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+# Stadtreinigung.Hamburg
+
+Add support for schedules provided by `Stadtreinigung.Hamburg`.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: stadtreinigung_hamburg
+      args:
+        asId: ASID
+        hnId: HNID
+```
+
+### Configuration Variables
+
+**asId**<br>
+*(string) (required)*
+
+**hnId**<br>
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: stadtreinigung_hamburg
+      args:
+        asId: 5087
+        hnId: 113084
+```
+
+## How to get the source arguments
+
+There is a script with an interactive command line interface which generates the required source configuration:
+
+[https://github.com/mampfes/hacs_waste_collection_schedule/blob/master/custom_components/waste_collection_schedule/package/wizard/stadtreinigung_hamburg.py](https://github.com/mampfes/hacs_waste_collection_schedule/blob/master/custom_components/waste_collection_schedule/package/wizard/stadtreinigung_hamburg.py).
+
+Just run this script from a shell and answer the questions.