Update README.md

Update the guide of how to deploy gogs in docker with the scripts.

dockerfiles/README.md

@@ -1,5 +1,39 @@
 ### Gogs Install With Docker
 
+Deply gogs in [Docker](http://www.docker.io/) is just as easy as eating a pie, what you do is just open the `dockerfiles/build.sh` file, replace the confis:
+
+```
+MYSQL_PASSWORD="YOUR_MYSQL_PASSWORD"
+MYSQL_RUN_NAME="YOUR_MYSQL_RUN_NAME"
+HOST_PORT="YOUR_HOST_PORT"
+```
+
+And run:
+```
+cd dockerfiles
+./build.sh
+```
+
+The build might take some time, just be paient. After it finishes, you will receive the message:
+
+```
+Now we have the MySQL image(running) and gogs image, use the follow command to start gogs service( the content might be different, according to your own configs):
+ docker run -i -t --link gogs_mysql:db -p 3333:3000 gogs/gogits
+```
+
+Just follow the message, run:
+
+```
+ docker run -i -t --link gogs_mysql:db -p 3333:3000 gogs/gogits
+```
+
+Now we have gogs running! Open the browser and navigate to:
+
+```
+http://YOUR_HOST_IP:YOUR_HOST_PORT
+```
+
+Let's 'gogs'!
 
 #### Gogs With MySQL