Install NodeJS, TypeScript, ExpressJS and ESLint

Install NodeJS, TypeScript, ExpressJS and ESLint with initial
configuration files.

Add initial instructions to README.md

src/app.ts

@@ -0,0 +1,11 @@
+import express from 'express'
+const app = express()
+const port = 3000
+
+app.get('/', (req, res) => {
+  res.send('Hello World!')
+})
+
+app.listen(port, () => {
+  return console.log(`Express is listening at http://localhost:${port}`)
+})