Add dummy admin properties file in Windows installer

dist/common/config.properties

@@ -0,0 +1,13 @@
+# This is the Cryptomator administrative configuration file.
+# It is a simple key-value pair file.
+# Lines starting with '#' are comments and will be ignored.
+#
+# There are some shorthands for well known folders:
+# Substitution Key | Variable Value
+# @{appdir}        | The application installation directory.
+# @{appdata}       | %APPDATA% (Windows only).
+# @{localappdata}  | %LOCALAPPDATA% (Windows only).
+# @{userhome}      | The user's home directory.
+#
+# Example:
+# cryptomator.pluginDir=@{appdata}/Cryptomator/Plugins #Sets a plugin directory and enables plugin loading