added express api

Author: korostelevm

.gitignore

@@ -0,0 +1 @@
+node_modules

README.md

@@ -1 +1,6 @@
 # starter-express-api
+
+This is the simplest possible nodejs api using express that responds to any request with: 
+```
+Yo!
+```

index.js

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+const express = require('express')
+const app = express()
+app.all('/', (req, res) => {
+    console.log("Just got a request!")
+    res.send('Yo!')
+})
+app.listen(process.env.PORT || 3000)