add simple version route

Signed-off-by: Arthur Lu <learthurgo@gmail.com>

package.json

@@ -2,6 +2,7 @@
 	"name": "proxmoxaas-api",
 	"version": "0.0.1",
 	"description": "REST API for ProxmoxAAS",
+	"main": "index.js",
 	"dependencies": {
 		"body-parser": "^1.20.1",
 		"cors": "^2.8.5",