connect db to server and create projects and users tables

[Leyla-Li]

75

• [x] Create tables in server/data/schema.sql.
• [x] Connect psql database to Node.js.
• [x] Successfully created tables in psql database.
• [x] Updated ReadMe with instructions to link schema.sql to psql.

[nurmerey]

Looking good so far! I want to try it out on my machine. Could you please update the readme file with the script that you used to create the db?