Added High Level Design.

Chess Game - High Level Design.md

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+# Chess Game - High Level Design
+
+### Server Side:
+
+​	Waits for a first client, then waits for another client and then puts them in a 
+​	lobby together.
+​	For each lobby just forwards each client msg to the other client.
+
+### Client Side:
+
+​	Connects to server and waits for another player.
+​	On player connection starts the game.
+​	If its the players turn waits for commands from the GUI.
+​	After getting a command from the GUI checks if its move or a chat command.	
+​	If its a move, check if its a valid move if its not, tells the GUI of the error.
+​	If the move is valid, check if after the move a check occurs check if a mate 
+​	occurs and tells the GUI and the server of the mate.
+​	If the move itself was valid, sends the move to the server.
+​	If after the move, the player has reached the end of the board, tells the GUI to 
+​	let him pick a piece and after the piece is chosen updates the board accordingly. 
+
+​	In the background, waits for messages from the server.
+​	For each message it checks whether its a chat message or a move.
+​	If its a move, updates the GUI and the board accordingly, and changes the turn.
+​	If its a chat message adds it to the GUI's chat,
+
+### GUI:
+
+​	Waits for a connection with the Client Side.
+​	After a connection, starts the game.
+​	On the player making a move, sends the move to Client Side and waits for 
+​	approval.
+
+​	In the background waits for chat messages and for moves coming from the 
+​	other player and deals with the respectively.