Added Comments to server.js and main.js

[schneedotdev]

Changes:

in package.json

• added npm run start script

in main.js

• added comments for functionality
• added description of how the app works in java doc format
• added authors to project

in server.js

• added comments for functionality and each endpoint
• fixed marked uncomplete endpoint by responding with "Marked UnComplete" instead of "Marked Complete"
• set variable PORT to process.env.PORT || PORT and changed app.listen to app.listen(PORT, ()=>{ console.log(`Server running on port ${PORT}`) }) to avoid bug where environment variable is used but the console.log prints out the PORT value 2121

authors: Brian Schnee, Erika Teal, Bianca Togonon, Alondra Mora, Lucas Winkler, Alyssha Lewin, Jacob Asper, Dana Lee, Brenden D'Souza, Sebastian Ospina, Jesse Ranon, Alexis Aguilar, Pree Robertson

[schneedotdev]

This PR should be assigned to Issue #41