format the doc and add comments

doc/install_gogs_from_binary_on_ubuntu.md

@@ -1,12 +1,14 @@
 ### Binary install gogs on ubuntu 14.04 LTS
 
+### create user and install denpendency
 - sudo adduser git
 - sudo apt-get update
 - sudo apt-get upgrade
-
 - sudo apt-get install git
 - sudo apt-get install golang
 - sudo apt-get install mysql-server
+
+### create the database
 - $mysql -u root -p
 - mysql> SET GLOBAL storage_engine = 'InnoDB';
 - mysql> CREATE DATABASE gogs CHARACTER SET utf8 COLLATE utf8_bin;
@@ -14,7 +16,7 @@
 - mysql> FLUSH PRIVILEGES;
 - mysql> QUIT
 
-
+### install the gogs
 - mkdir gogs
 - cd gogs
 - curl -L http://gobuild.io/github.com/gogits/gogs/v0.2.0/linux/amd64 -o v0.2.0.zip