Total score = 20 points 
		(Content of the Readme file = 2 points, Testcases = 18 points)


Testcases:

After each operation, you need to show(print) each node with its corresponding 
files. 

- Test 1 (2 points)
	initilization: node 0
	join one node: nodes 0, 1
	join one more node: nodes 0, 1, 2

- Test 2 (2 points)
	node 1 publishes file 8
	node 0: file 8, (8+1)%3
	node 1: 
	node 2: file 8,  8%3

- Test 3 (1 point)
	node 0 publishes file 7 
	node 0: file 8 
	node 1: file 7 
	node 2: file 8, file 7

- Test 4 (3 points)
	add one more node
	node 0: file 8, file 7                                   
	node 1: file 8
	node 2:
	node 3: file 7

- Test 5 (2 points)
	node 2 retrieves file 8
	show the content of the file at node 2
	show form which node the files was retrieved

- Test 6 (4 points)
	node 1 leaves (some nodes get new IDs after this operation)
	node 0: file 8 
	node 1: file 7 
	node 2: file 8, file 7

- Test 7 (2 points)
	- node 1 retrieves file 8. show the content of the file as it arrives.
	- the node that sends the file (0 or 2) should sleep for a while
	during the transfer.
	- when this node is sleeping (the server thread), the client on that 
	node requests to leave the network (have the "sleep" call commented out
	in your code)
	- expected result: the node wakes up, finishes the transfer, and only
	after that leaves the network

- Test 8 (2 points)
	- add one node (nodes 0, 1, 2), and similar to test 7, include a sleep
	call in one of the replication operations.
	- during the sleep time, try to add one more node
	- then, node 1 tries to leave the network
	- expected result: the nodes trying to join/leave receive 
	a "try again" message