Added and updated comments throughout entire project

server.js

@@ -1,14 +1,14 @@
-require("./mongoConfig")
+require("./mongoConfig") //take mongoose info from config file
 
-const express = require('express');
+const express = require('express'); //import express
 const routes = require('./routes/msg'); //import the routes
-const helmet = require('helmet'); 
-const compression = require('compression'); 
-const morgan = require('morgan')
+const helmet = require('helmet'); //import helmet
+const compression = require('compression'); //import compression
+const morgan = require('morgan') //import morgan
 
 const app = express();
 
-app.use(helmet());
+app.use(helmet()); //add json security
 app.use(compression()); //compress all routes
 app.use(express.json()); //parses incoming requests with JSON payloads
 app.use(morgan('combined')) //prints logging when requests are made
@@ -21,6 +21,7 @@ app.route("/")
     res.sendFile(process.cwd() + '/index.html');
 });
 
+//listens to port 3000 (or whichever port heroku chooses)
 const listener = app.listen(process.env.PORT || 3000, () => {
   console.log('App is listening on port ' + listener.address().port)
 })