Added brief descriptions to frontend .h files

groundStation/src/frontend/frontend_common.h

+/**
+ * Frontend contains the functions used by both the GUI and CLI to communicate
+ * with the quad and VRPN system.
+ *
+ * frontend_common.c has the varius structs used within the frontend to pass
+ * data between the system. It also contains the methods to connect, disconnect,
+ * and write from/to the quad. 
+ */
 #ifndef _FRONTEND_COMMON_H
 #define _FRONTEND_COMMON_H
 #include <stdlib.h>

groundStation/src/frontend/frontend_nodes.h

+/**
+ * frontend_nodes writes the getnodes or setnodes command to the backend connection.
+ */
+
 #ifndef _FRONTEND_NODES_H
 #define _FRONTEND_NODES_H
 

groundStation/src/frontend/frontend_output.h

+/**
+ * frontend_output writes the getoutput command to the backend connection.
+ */
+
 #ifndef _FRONTEND_OUTPUT_H
 #define _FRONTEND_OUTPUT_H
 

groundStation/src/frontend/frontend_param.h

+/**
+ * frontend_param writes the getparam or setparam command to the backend connection.
+ */
+
 #ifndef _FRONTEND_PARAM_H
 #define _FRONTEND_PARAM_H
 

groundStation/src/frontend/frontend_source.h

+/**
+ * frontend_source writes the getsource and setsource command to the backend
+ * connection.
+ */
+
 #ifndef _FRONTEND_SOURCE_H
 #define _FRONTEND_SOURCE_H
 

groundStation/src/frontend/frontend_tracker.h

+/**
+ * frontend_tracker contains the struct for VRPN data and provides the method to
+ * get the data from the frontend by writing TRACKERDATA to the backend.
+ */
+
 #ifndef __FRONTEND_TRACKER_H
 #define __FRONTEND_TRACKER_H