Create faq.md

docs/faq.md

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+[googleplay-release]: https://play.google.com/store/apps/details?id=com.dergoogler.mmrl
+[github-release]: https://github.com/DerGoogler/MMRL
+[mmrlini]: https://github.com/DerGoogler/mmrl_install_tools
+[mmrlini-release]: https://github.com/DerGoogler/mmrl_install_tools/releases
+
+# **F**requently **A**sked **Q**uestions 
+
+> We do not recommend to delete the entire `/data/adb/mmrl` folder. This folder contains your saved ModConf Playground file and other config files like from [MMRL Install Tools][mmrlini-release]
+
+## MMRL does not load correctly or shows a empty screen
+
+This my due internal config changes or invalid config files
+
+To solve this, try the following options:
+
+- reinstall the app from [GitHub Releases][github-release] or the [Google Play Store][googleplay-release]
+- clean app data and cache
+- removing `/data/adb/mmrl/settings.v*.json` or `/data/adb/mmrl`
+
+## Cannot install or update modules
+
+Try updating [MMRL Install Tools][mmrlini-release] or remove the `/data/adb/mmrl/mmrlini.v*.ini` config file