organize code and write readme

Author: biancarosa

README.md

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+# golang-http-server
+
+Examples on how to use Golang's standard library to run an http server.
+
+- [hello_world.go](hello_world.go) - a simple hello world.
+- [json_response.go](json_response.go) - an example with a json response.

hello_world.go

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+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+func hello(w http.ResponseWriter, r *http.Request) {
+	io.WriteString(w, "Hello world")
+}
+
+func main() {
+	http.HandleFunc("/", hello)
+	fmt.Println("Serving http...")
+	http.ListenAndServe(":8000", nil)
+}