Angela/protected links

Acceptance criteria:

• Create a new POST endpoint that accepts a JSON body in the request
• The JSON body should contain one key: links, a list of link objects
• This endpoint should be password protected using HTTP auth
  • Potential library: https://flask-httpauth.readthedocs.io/en/latest/
• Update the DB with the new links (https://docs.python.org/3/library/sqlite3.html