Add README.md for project description

README.md

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+# Network-Manager VPN Plugin for Wireguard
+
+## Compilation
+* `./autogen.sh`
+* `make`
+
+## Modifying the source (Visual Studio Code)
+* Open the folder in Code
+* Do the compilation steps as above
+* `cat Makefile | ./includes2strings.py`
+* take the output of the script and put it in the appropriate section of `.vscode/c_cpp_properties.json` (for me: appended to `includePath` of configuration `Linux`)
+
+## Execution
+The following section briefly describes how to start the stuff for testing purposes
+
+* `./src/nm-openvpn-service --bus-name org.freedesktop.NetworkManager.wireguard` to start the plugin
+* `examples/dbus/dbus.py` to send Disconnect() to the plugin