Adding docs for 'sudo'

pages/common/sudo.md

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+# sudo
+
+> execute a command as another user
+
+- Listing of an unreadable directory:
+
+`sudo ls /usr/local/scrt`
+
+- To list the home directory of non-root user
+
+`sudo -u Jhon ls ~Jhon`
+
+- To edit a file as user www:
+
+`sudo -u www vi /var/www/index.html`
+
+- To shutdown the machine:
+
+`sudo shutdown -r +10 "Cya soon!"`
+
+- To repeat the last command as sudo
+
+`sudo !!`