Add Heroku generated app.json

Author: kbowerma

app.json

@@ -0,0 +1,39 @@
+{
+  "name": "dsp-app",
+  "description": "Airbus DSP",
+  "scripts": {
+  },
+  "env": {
+    "REACT_APP_API_BASE_PATH": {
+      "required": true
+    },
+    "REACT_APP_AUTH0_CLIEND_ID": {
+      "required": true
+    },
+    "REACT_APP_AUTH0_DOMAIN": {
+      "required": true
+    },
+    "REACT_APP_GOOGLE_API_KEY": {
+      "required": true
+    },
+    "REACT_APP_SOCKET_URL": {
+      "required": true
+    }
+  },
+  "formation": {
+    "web": {
+      "quantity": 1
+    }
+  },
+  "addons": [
+    "papertrail"
+  ],
+  "buildpacks": [
+    {
+      "url": "heroku/nodejs"
+    },
+    {
+      "url": "https://github.com/mars/create-react-app-buildpack.git"
+    }
+  ]
+}