final fix

README.md

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+## Task 2
+program starts, asks user id, and corespondent id. 
+
+#### commands
+- `exit` program exits
+
+## Task 3
+Task 3 follows the same proccess as Task 2. but implements additional commands to block and unblock correspondents
+- `exit` program exits
+- `-b <user>` block a user
+- `-u <user>` unblocks user