Implement MFS_Init() and a helper function for sending commands via UDP
mfs.c: Add code for sending command to the server to all functions
server.c: Add dummy command handlers
server.c: Respond to client with the name of received command
server.c: Create filesystem image if it doesn't already exist
server.c: Pass filesystem image fd to handlers
server.c: Make server respond with command status and its output if applicable
server.c: Properly handle binary output