Add a Heroku app.json

app.json

@@ -0,0 +1,26 @@
+
+{
+  "name": "Frankfurter",
+  "description": "A foreign exchange rates and currency conversion API",
+  "website": "https://frankfurter.app",
+  "repository": "https://github.com/hakanensari/frankfurter",
+  "logo": "https://frankfurter.app/images/frankfurter.png",
+  "keywords": [
+    "forex",
+    "foreign exchange rates",
+    "currency",
+    "api"
+  ],
+  "env": {
+    "APP_ENV": {
+      "description": "The app environment.",
+      "value": "production",
+    }
+  },
+  "addons": [
+    "heroku-postgresql"
+  ],
+  "scripts": {
+    "postdeploy": "bundle exec rake db:migrate rates:ninety_days"
+  }
+}