Add metadata response to index route

main.go

@@ -1,13 +1,23 @@
 package main
 
 import (
+	"encoding/json"
 	"net/http"
 
 	"github.com/gorilla/mux"
 )
 
+const Name string = "Lithium"
+const Version string = "0.1.0"
+
+type Metadata struct {
+	Name    string
+	Version string
+}
+
 func IndexHandler(w http.ResponseWriter, r *http.Request) {
-	w.Write([]byte("hello world!"))
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(Metadata{Name, Version})
 }
 
 func main() {