Adding One-Click Deploy on Heroku

Dockerfile

@@ -0,0 +1 @@
+FROM meteorhacks/meteord:onbuild

README.md

@@ -46,6 +46,12 @@ cd Rocket.Chat
 meteor
 ```
 
+## One-Click Deploy
+
+Deploy on Heroku:
+
+[![Deploy](https://www.herokucdn.com/deploy/button.png)](https://heroku.com/deploy)
+
 ## Features
 
 - Direct Messages

app.json

@@ -0,0 +1,16 @@
+{
+  "name": "Rocket.Chat",
+  "description": "Have your own open-source Slack-like online chat, built with Meteor.",
+  "repository": "https://github.com/RocketChat/Rocket.Chat",
+  "logo": "http://rocket.chat/images/logo/logo-dark.svg",
+  "keywords": ["meteor", "social", "community", "chat"],
+  "env": {
+    "BUILDPACK_URL": "https://github.com/AdmitHub/meteor-buildpack-horse.git",
+    "ROOT_URL": {
+      "description": "The full URL of your Rocket.Chat app (by default, http://appname.herokuapp.com)."
+    }
+  },
+  "addons": [
+    "mongolab"
+  ]
+}