added documentation for restart policy

Author: shreyaskarnik

README.md

@@ -232,7 +232,7 @@ Identical to the `docker search` command.
 ```python
 c.start(container, binds=None, port_bindings=None, lxc_conf=None,
         publish_all_ports=False, links=None, privileged=False,
-        dns=None, dns_search=None, volumes_from=None, network_mode=None)
+        dns=None, dns_search=None, volumes_from=None, network_mode=None, restart_policy=None)
 ```
 
 Similar to the `docker start` command, but doesn't support attach
@@ -258,6 +258,27 @@ docker bridge, 'none': no networking for this container, 'container:[name|id]':
 reuses another container network stack), 'host': use the host network stack
 inside the container.
 
+`restart_policy` is available since v1.2.0 and sets the RestartPolicy for how a container should or should not be 
+restarted on exit. By default the policy is set to no meaning do not restart the container when it exits. 
+The user may specify the restart policy as a dictionary for example:
+for example: 
+```
+{
+    "MaximumRetryCount": 0, 
+    "Name": "always"
+}
+```
+for always restarting the container on exit or can specify to restart the container to restart on failure and can limit
+number of restarts. 
+for example:
+```
+{
+    "MaximumRetryCount": 5, 
+    "Name": "on-failure"
+}
+```
+
+ 
 ```python
 c.stop(container, timeout=10)
 ```