add Alia Servizi Ambientali S.p.A., Italy

doc/source/aliaserviziambientali_it.md

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+# Alia Servizi Ambientali S.p.A.
+
+Support for schedules provided by [Alia Servizi Ambientali S.p.A.](https://www.aliaserviziambientali.it), serving multiple municipalities, Italy.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: aliaserviziambientali_it
+      args:
+        municipality: MUNICIPALITY (Comune)
+        area: AREA
+```
+
+### Configuration Variables
+
+**municipality**  
+*(String) (required)*
+
+**area**  
+*(Integer|String) (Optional)* see below
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: aliaserviziambientali_it
+      args:
+        municipality: Gambassi Terme     
+```
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: aliaserviziambientali_it
+      args:
+        municipality: Barberino Tavarnelle
+        area: 67334
+```
+
+## How to get the source argument
+
+Visit <https://www.aliaserviziambientali.it/it-it/raccolta-rifiuti> and select your municiaplity, if you see an embedded calendar you can just use the municipality name, and leave the area empty. If you see a list of areas, you need to follow the link to the area calendar, there you can fin the area ID in the URL, for example: `https://differenziata.junker.app/embed/barberino-tavarnelle/area/67333/calendario` the area ID is `67333`.