Update readme

README.md

 # Admin Plugin
 
+to build this and tag with the 1.0.2 version, use the following command
+
+```
+docker build . -t registry1.dso.mil/ironbank/mattermost/admin-plugin:1.0.2
+```
+
+You'll need to provide the environment vars for TARGET_URL and TARGET_TOKEN.
+Note that the --network allows you to provide the name of the network that your mattermost instance is running on so that the url may be resolved.
+
+```
+docker run -d --network=mattermost-docker-with-debug_ent-collab_net -e TARGET_URL=http://mattermost-docker-with-debug_mattermost_app_1:8065 -e TARGET_TOKEN=cenneh38ifd9tfqy7trwra918r  registry1.dso.mil/ironbank/mattermost/admin-plugin:1.0.2
+```
+
+that command will start the container, auth to the MM server, remove then install the plugin, then exit.
+
+
+
+
+
+