Readme needs more information

[m4v15]

relates #22 #20

All readme's should have a minimum:

• Link to the live site
• Short explanation of what is in the repo.
• Explanation of how to run the repo locally. This should include instructions such as:
  • clone the repo
  • run npm i
  • run whatever the script is to run in developer mode
  • instructions on what to put in a config.env file - this needs to include the variable name, and the type of variable - eg 'create a config.env file and put in a postgres database url, giving it the name DB_URL'
  • instructions on how to build the database

[m4v15]

• how to run tests