Update README.md

README.md

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 # XtendR
 
-A python 3 extension system to ease the use of plugins.
+A very basic python 3 extension system to ease the use of plugins.
+
+At the moment only 4 functions are available:
+- Attach
+- Run
+- Stop
+- Detach
+
+Attach and Detach are used for registrering/unregistrering a module on the system.
+The Run and Stop functions are mandatory in the plugin modules.
+
+The example.py file shows the workings of this plugin system.