Created Clean Uninstall (markdown)

Clean-Uninstall.md

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+Once you uninstall Rambox, the uninstaller is not removing the folder that contains the data of the app (localStorage, Cache, etc).
+
+To make a clean uninstall, remove manually the following folder:
+
+# Location
+## Windows
+`C:/Users/your_user/AppData/Roaming/Rambox`
+## macOS
+`/Users/username/Library/Application Support/Rambox`
+## Linux
+`~/.config/Rambox`