Created Edit configuration manually (markdown)

Edit-configuration-manually.md

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+All the configurations of Rambox are stored in a file with JSON format called **config.json**.
+
+If you have a problem with opening Rambox or bad functionality, please check the file or just remove it.
+
+# Location
+## Windows
+`C:/Users/your_user/AppData/Roaming/Rambox/config.json`
+## macOS
+`/Users/username/Library/Application Support/Rambox/config.json`
+## Linux
+`~/.config/Rambox/config.json`