Add wiki documents

docs/getting-started/basic-setup.md

@@ -0,0 +1,30 @@
+# Basic Setup
+
+To apply the Mushroom Strategy to a dashboard:
+
+1. In the UI of the dashboard, select :material-pencil: in the top right corner.
+2. If not taken to a Raw Configuration editor, click the three-dot menu in the top right corner.
+3. Select `Raw configuration editor`.
+4. Empty the configuration and add the following lines:
+
+   ```yaml
+   strategy:
+     type: custom:mushroom-strategy
+   views: []
+   ```
+
+> [!NOTE]
+> You may see the following error:
+
+```
+ Error loading the dashboard strategy:
+     Error: Timeout waiting for strategy
+     element ||-strategy-mushroom-strategy to
+     be registered
+```
+
+This is mainly because of cache issues or HACS didn't create a reference.  
+Try clearing the cache of your client and/or re-downloading the strategy from HACS.
+
+If it still doesn't work, please consult guide
+[How to solve: Error loading the dashboard strategy](https://github.com/DigiLive/mushroom-strategy/discussions/90).