Added source for uppsalavatten_se and updated readme.md+info.md

doc/source/uppsalavatten_se.md

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+# Uppsala Vatten och Avfall AB
+
+Support for schedules provided by [Uppsala Vatten och Avfall AB](https://www.uppsalavatten.se), serving the municipality of Uppsala. 
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: uppsalavatten_se
+      args:
+        street: STREET_NAME
+        city: CITY_NAME
+```
+
+### Configuration Variables
+
+**street**
+*(string) (required)*
+
+**city**
+*(string) (required)*
+
+## Example
+
+```yaml
+waste_collection_schedule:
+  sources:
+    - name: uppsalavatten_se
+      args:
+        street: SADELVÄGEN 1
+        city: BJÖRKLINGE
+```
+
+
+## How to get the source argument
+
+The source argument is the street including number and the city to the house with waste collection.
+The address can be tested [here](https://www.uppsalavatten.se/sjalvservice/hamtningar-och-berakningar/dag-for-sophamtning-och-slamtomning).
+
+
+