Adds required files

Dockerfile

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+FROM hasuranightly/raven:c9a69e1
+
+CMD raven \
+    --database-url $DATABASE_URL \
+    serve \
+    --server-port $PORT \
+    --cors-domain "http://localhost:9695"

README.md

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+# Hasura GraphQL Engine on Heroku
+
+## Prerequisites
+
+- Heroku CLI
+- Heroku Account
+- Docker
+
+## Setting up
+
+- Create a Heroku App
+```
+$ heroku create
+Creating app... done, ⬢ thawing-savannah-75305
+https://thawing-savannah-75305.herokuapp.com/ | https://git.heroku.com/thawing-savannah-75305.git
+```
+Note the app name `thawing-savannah-75305` from the command above. 
+In the next commands, substitute `<app-name>` with `thawing-savannah-75305`
+
+- Create a Heroku Postgres Addon for this app
+```bash
+$ heroku addons:create heroku-postgresql:hobby-dev -a thawing-savannah-75305
+```
+
+## Deploy
+
+- Switch to the `heroku/setup` directory. You should have a `Dockerfile` when you hit `ls`:
+  ```bash
+  $ ls
+  Dockerfile README.md
+  ```
+- Make sure you're logged in to heroku's container registry:
+  ```
+  $ heroku container:login
+  ```
+- Execute the following commands to deploy
+  ```bash
+  heroku container:push web -a <app-name>
+  heroku container:release web -a <app-name>
+  ```
+- Check the logs to verify if everything is ok:
+  ```bash
+  heroku logs -a <app-name>
+  ```
+
+## Configure
+
+(Assuming you have already executed `hasura init`)
+
+- Edit `config.yaml` and add `endpoint` as the Heroku App URL
+  ```yaml
+  endpoint: https://<app-name>.herokuapp.com
+  ```
+
+## Console
+
+Open the console and start exploring APIs / manage tables/views:
+```bash
+hasura console
+```

app.json

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+{
+	"name": "Hasura GraphQL Engine",
+	"description": "Hasura GraphQL Engine <> heroku",
+	"keywords": [
+		"graphql",
+		"backend",
+		"heroku",
+    "graphqlapi"
+	],
+	"repository": "https://github.com/karthikvt26/heroku-push",
+  "formation": {
+    "web": {
+      "quantity": 1,
+      "size": "free"
+    }
+  },
+  "stack": "container",
+  "addons": [
+    {
+      "plan": "heroku-postgresql:hobby-dev"
+    }
+  ]
+}

heroku.yml

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+build: 
+  docker:
+    web: Dockerfile