Merge branch 'groundstation_documentation' into 'develop'

Groundstation documentation

See merge request !85

groundStation/src/frontend/Readme.md

+Frontend Explained
+==================
+
+The frontend is what handles clients. It manages a connection to the backend over
+a tcp socket. It features a number of possible commands which can be sent to the backend.
+The GUI and CLI are both clients that call functions on the frontend directly in order to
+communicate with the backend.
+
+See the groundstation readme for more information about possible commands.
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