Update common-issues.md (#478)

* Update common-issues.md

Adding images in next commit.
Expanded on Feeder App common issues

* Repair feeder app

Repair and enable feeder app

* Added images to common issues

Author: Amelia-bun

src/assets/img/Common-issues-repair-feeder-app.webp

@@ -28,7 +28,14 @@ From there, switch the setting called "Network Profile Type" to "Private Network
 ![network2](assets/img/network_private_2.png)
 
 ## SlimeVR Feeder App not connected
-Ensure SteamVR is running and that the SlimeVR Feeder app is enabled in the Startup Overlay Apps.
+Ensure both SlimeVR and SteamVR are running and that the SlimeVR Feeder app is enabled in the Startup Overlay Apps. Follow the guide below on enabling it.
+![Enable Feeder App](assets/img/Common-issues-repair-feeder-app.webp)
+
+If the app does not appear in SteamVR, you may have to run the SlimeVR installer again in Repair Mode. Make sure "SlimeVR Feeder App" is ticked before continuing.
+![Repair Feeder App](assets/img/Spazzwan-enable-feeder-app.webp)
+
+## Feeder App window closes immediately after opening
+This is intended behaviour on later versions—the Feeder app continues to run in the background after the window auto-closes. 
 
 ## The SlimeVR Server won't start