Add Doorstop config

doorstop/doorstop_config.ini

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+[UnityDoorstop]
+# Specifies whether assembly executing is enabled
+enabled=true
+# Specifies the path (absolute, or relative to the game's exe) to the DLL/EXE that should be executed by Doorstop
+targetAssembly=BepInEx\bin\BepInEx.dll