Added client code

assignment2/client.py

+# Client to send lock / unlock to servers
+class Client:
+    def __init__(self, server_ips) -> None:
+        self.server_ips = server_ips
+
+    # Returns true if lock is successful, false otherwise
+    # x : value to lock (int)
+    def lock(self, x) -> bool:
+        json = {"op": "lock", "value": x}
+        for server_ip in self.server_ips:
+            pass
+            # Send JSON to servers, will be treated as command
+        # Wait for response to return
+
+    # Returns true if unlock is successful, false otherwise
+    # x : value to lock (int)
+    def unlock(self, x) -> bool:
+        json = {"op": "unlock", "value": x}
+        for server_ip in self.server_ips:
+            pass
+            # Send JSON to servers, will be treated as command
+        # Wait for response to return
+