add configuration to run end-to-end tests with cypress

Author: edouard-lopez

cypress.json

@@ -0,0 +1,4 @@
+{
+  "baseUrl": "http://localhost:3000/",
+  "video": false
+}

package.json

@@ -11,7 +11,9 @@
     "start": "react-scripts start",
     "build": "react-scripts build",
     "test": "react-scripts test",
-    "eject": "react-scripts eject"
+    "eject": "react-scripts eject",
+    "ci:e2e": "cypress run",
+    "test:e2e": "cypress run --config baseUrl=http://localhost:3000/"
   },
   "eslintConfig": {
     "extends": "react-app"
@@ -21,5 +23,8 @@
     "not dead",
     "not ie <= 11",
     "not op_mini all"
-  ]
+  ],
+  "devDependencies": {
+    "cypress": "^3.2.0"
+  }
 }