Add welcome message

app.py

@@ -1,5 +1,5 @@
 import os
-from flask import Flask, request, abort
+from flask import Flask, request, abort, jsonify
 
 import unlocker
 
@@ -10,8 +10,15 @@ UNLOCKER_PIN = os.environ.get('UNLOCKER_PIN') or 'XIO-P7'
 app = Flask(__name__)
 
 
-@app.route('/unlock')
+@app.route('/')
 def root():
+    return jsonify({
+        'message': "Welcome to my door!",
+    })
+
+
+@app.route('/unlock')
+def unlock():
     code = request.args.get('code')
 
     if (code == CODE):