implemented heilbronn_de

doc/source/heilbronn_de.md

@@ -0,0 +1,42 @@
+# Heilbronn Entsorgungsbetriebe
+
+Support for schedules provided by [heilbronn.de](https://www.heilbronn.de/).
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: heilbronn_de
+      args:
+        plz: PLZ
+        strasse: STRASSE
+        hausnr: HAUSNR
+```
+
+### Configuration Variables
+
+**plz**  
+*(integer | integer) (required)*
+
+**strasse**  
+*(string) (required)*
+
+**hausnr**  
+*(string | integer) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: bsr_de
+      args:
+        plz: 74072
+        abf_strasse: "Rosenau"
+        abf_hausnr: 33
+```
+
+## How to get the source arguments
+
+Use your PLZ, street and house number. You can check if [Abfallratgeber Heilbronn](https://abfallratgeber.heilbronn.de/#!/calendar) shows correct values, then use exactly the same spelling for your configuration.