Rename stadtreinigung_dresden.md to stadtreinigung_dresden_de.md

doc/source/stadtreinigung_dresden_de.md

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+# Stadtreinigung Dresden
+
+Add support for schedules provided by [https://www.dresden.de/](https://www.dresden.de/apps_ext/AbfallApp/wastebins?0).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: stadtreinigung_dresden
+      args:
+        standort: STANDORT_ID
+```
+
+### Configuration Variables
+
+**standort**<br>
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: stadtreinigung_dresden
+      args:
+        standort: 80542
+```
+
+## How to get the source arguments
+
+Open [https://www.dresden.de/](https://www.dresden.de/apps_ext/AbfallApp/wastebins?0) and search for schedules for your location.
+
+Check the Link-URL for downloading the schedules as *.PDF and extract the number after field `STANDORT`.
+
+Example:
+
+`https://stadtplan.dresden.de/project/cardo3Apps/IDU_DDStadtplan/abfall/kalender.ashx?STANDORT=80542&DUMMY=637834733764191577`
+
+The resulting `STANDORT_ID` is `80542`.