Add a Hasura starter (#61)

examples/hasura/.gitignore

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+
+*.temp

examples/hasura/Dockerfile

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+FROM hasura/graphql-engine:v1.3.3
+
+# Enable the console
+ENV HASURA_GRAPHQL_ENABLE_CONSOLE=true
+
+# Enable debugging mode. It should be disabled in production.
+ENV HASURA_GRAPHQL_DEV_MODE=true
+
+# Heroku hobby tier PG has few limitations including 20 max connections
+# https://devcenter.heroku.com/articles/heroku-postgres-plans#hobby-tier
+ENV HASURA_GRAPHQL_PG_CONNECTIONS=15
+
+# Change $DATABASE_URL to your heroku postgres URL if you're not using
+# the primary postgres instance in your app
+CMD graphql-engine \
+    --database-url $DATABASE_URL \
+    serve \
+    --server-port $PORT
+
+## Comment the command above and use the command below to
+## enable an access-key and an auth-hook
+## Recommended that you set the access-key as a environment variable in heroku
+#CMD graphql-engine \
+#    --database-url $DATABASE_URL \
+#    serve \
+#    --server-port $PORT \
+#    --access-key XXXXX \
+#    --auth-hook https://myapp.com/hasura-webhook 
+#
+# Console can be enable/disabled by the env var HASURA_GRAPHQL_ENABLE_CONSOLE

examples/hasura/README.md

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+# Hasura example
+
+This example sets up a [Hasura](https://hasura.io/opensource/) instance with a [PostgreSQL](https://www.postgresql.org/) database.
+
+[![Deploy on Railway](https://railway.app/button.svg)](https://railway.app/new?template=https%3A%2F%2Fgithub.com%2Frailwayapp%2Fexamples%2Ftree%2Fmaster%2Fexamples%2Fhasura&plugins=postgresql&envs=HASURA_GRAPHQL_ADMIN_SECRET&HASURA_GRAPHQL_ADMIN_SECRETDesc=To+secure+your+GraphQL+endpoint+and+the+Hasura+console.)
+
+## ✨ Features
+
+- Postgres
+- Hasura
+
+## 💁‍♀️ How to use
+
+- Click the `Deploy on Railway` button
+- Set up a `HASURA_GRAPHQL_ADMIN_SECRET` to secure your endpoints and console.
+- Visit your console after the deployment is complete
+
+## 📝 Notes
+
+- This starter automagically provisions a PostgreSQL database for you when you click the `Deploy on Railway`. The `DATABASE_URL` enviroment variable used in the `Dockerfile` is picked up from there.
+- The Hasura console and dev mode are enabled by default for a better development experience. You may want to read the [production checklist](https://hasura.io/docs/latest/graphql/core/deployment/production-checklist.html) before going live with your app.