Create a requirements.txt file

[sbshah97]

• A requirements.txt file is easier for users to set up when they set it up using a virtual environment!
• Also check out pipreqs to get all the necessary Python modules needed for running the server!
• Try specifying which Python version is needed in the README. Py2.7 or Py3.6
• Simple bash command to execute this is:

pipreqs . --print > requirements.txt

P.S. Instructions to set up a virtual environment and then run SimOS would highly be useful!