Created man page for nsinit

Signed-off-by: Shishir Mahajan <shishir.mahajan@redhat.com>

docs/man/nsinit.1.md

@@ -0,0 +1,38 @@
+% nsinit User Manual
+% docker/libcontainer
+% JAN 2015
+
+NAME:
+   nsinit - A low-level utility for managing containers.
+	    It is used to spawn new containers or join existing containers.
+
+USAGE:
+   nsinit [global options] command [command options] [arguments...]
+
+VERSION:
+   0.1
+
+COMMANDS:
+	config	display the container configuration 
+	exec	execute a new command inside a container
+	init	runs the init process inside the namespace
+	oom	display oom notifications for a container
+	pause	pause the container's processes
+	stats	display statistics for the container
+	unpause	unpause the container's processes
+	help, h	shows a list of commands or help for one command
+
+EXAMPLES:
+
+Get the <container_id> of an already running docker container.
+`sudo docker ps` will return the list of all the running containers.
+
+take the <container_id> (e.g. 4addb0b2d307) and go to its config directory
+`/var/lib/docker/execdriver/native/4addb0b2d307` and here you can run the nsinit
+command line utility.
+
+e.g. `nsinit exec /bin/bash` will start a shell on the already running container.
+   
+# HISTORY
+Jan 2015, Originally compiled by Shishir Mahajan (shishir dot mahajan at redhat dot com)
+based on nsinit source material and internal work.