Add optional name + docs (#25)

* Add optional name

* docs: add README.md with project documentation

src/greeting.js

@@ -1,5 +1,13 @@
-function getGreeting() {
-  return 'Hello world';
+function getGreeting(name) {
+  const greeting = `Hello world!`;
+
+  if (name) {
+    const wisher = `From ${name}`;
+
+    return `${greeting} ${wisher}`;
+  }
+
+  return greeting;
 }
 
 module.exports = { getGreeting };

src/server.js

@@ -1,11 +1,19 @@
-const express = require('express');
-const { getGreeting } = require('./greeting');
+const express = require("express");
+const { getGreeting } = require("./greeting");
 
 const app = express();
 const PORT = process.env.PORT || 3000;
 
-app.get('/hello', (req, res) => {
-  res.send(getGreeting());
+app.get("/hello/:name?", (req, res) => {
+  const name = req.params.name;
+
+  res.send(getGreeting(name));
+});
+
+app.post("/hello", (req, res) => {
+  const name = req.headers["x-name"];
+
+  res.send(getGreeting(name));
 });
 
 if (require.main === module) {