add snaga_mb_si

doc/source/snaga_mb_si.md

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+# Snaga Maribor
+
+Support for schedules provided by [Snaga Maribor](https://snaga-mb.si/), serving Snaga Maribor, Slovenia.
+
+## Configuration via configuration.yaml
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: snaga_mb_si
+      args:
+        street: STREET (Naziv)
+        house_number: "HOUSE NUMBER (HS)"
+        
+```
+
+### Configuration Variables
+
+**street**  
+*(String) (required)*
+**house_number**  
+*(String | Integer) (required)*
+
+
+## Example
+
+```yaml
+waste_collection_schedule:
+    sources:
+    - name: snaga_mb_si
+      args:
+        street: Ruska ulica
+        house_number: "24"
+        
+```
+
+## How to get the source argument
+
+Find the parameter of your address using [https://snaga-mb.si/koledar-odvoza-odpadkov/](https://snaga-mb.si/koledar-odvoza-odpadkov/) and write them exactly like on the web page.