Created Basic usage (markdown)

Basic-usage.md

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+# Basic usage
+
+- This is the **main window**:  
+![main window](https://github.com/Botspot/pi-apps/blob/master/icons/screenshots/main%20window.png?raw=true)  
+Use the main window to select an app category you want to view. Open a category folder by double-clicking on it.  
+- After selecting a category, you will see a list of apps:  
+![app list](https://github.com/Botspot/pi-apps/blob/master/icons/screenshots/app%20list.png?raw=true)  
+- If you double-click an app, or select and app and click ![info.png](https://raw.githubusercontent.com/Botspot/pi-apps/master/icons/info.png), you will see the **Details window**.  
+![details](https://github.com/Botspot/pi-apps/blob/master/icons/screenshots/details%20window.png?raw=true)  
+- Pi-Apps may display a notification on boot. If you choose to view the updates, the **updater window** will appear:  
+![updates](https://github.com/Botspot/pi-apps/blob/master/icons/screenshots/updates%20available.png?raw=true)  
+- Pi-Apps **Settings** can be configured by launching Menu -> Preferences -> Pi-Apps Settings.  
+![settings](https://github.com/Botspot/pi-apps/blob/master/icons/screenshots/settings.png?raw=true)