title: Python Boto3: set session, create an EC2 instance and run command using csdshell
body: <p>I need to write a python script using boto3 which does the following, </p>
  
  <ul>
  <li>set aws access &amp; secret key for my session</li>
  <li>then create an ec2 instance (using ami image)</li>
  <li>execute a command in newly created ec2 instance</li>
  </ul>