Add 'kpod pull' command

Signed-off-by: umohnani8 <umohnani@redhat.com>

docs/kpod-pull.1.md

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+% kpod(8) # kpod-pull - Simple tool to pull an image from a registry
+% Urvashi Mohnani
+% JULY 2017
+# NAME
+kpod-pull - Pull an image from a registry
+
+# SYNOPSIS
+**kpod pull**
+**NAME[:TAG|@DISGEST]**
+[**--help**|**-h**]
+
+# DESCRIPTION
+Copies an image from a registry onto the local machine. **kpod pull** pulls an
+image from Docker Hub if a registry is not specified in the command line argument.
+If an image tag is not specified, **kpod pull** defaults to the image with the
+**latest** tag (if it exists) and pulls it. **kpod pull** can also pull an image
+using its digest **kpod pull [image]@[digest]**.
+
+**kpod [GLOBAL OPTIONS]**
+
+**kpod pull [GLOBAL OPTIONS]**
+
+**kpod pull NAME[:TAG|@DIGEST] [GLOBAL OPTIONS]**
+
+# GLOBAL OPTIONS
+
+**--help, -h**
+  Print usage statement
+
+# COMMANDS
+
+## pull
+Pull an image from a registry
+
+# SEE ALSO
+kpod(1), crio(8), crio.conf(5)
+
+# HISTORY
+July 2017, Originally compiled by Urvashi Mohnani <umohnani@redhat.com>