add eslint dependencies (#107)

Author: rodineijf

template/package.json

@@ -6,7 +6,8 @@
     "android": "react-native run-android",
     "ios": "react-native run-ios",
     "start": "react-native start",
-    "test": "jest"
+    "test": "jest",
+    "lint": "eslint . --ext .js,.jsx,.ts,.tsx"
   },
   "dependencies": {
     "react": "16.9.0",
@@ -19,7 +20,9 @@
     "@types/jest": "^24.0.18",
     "@types/react-native": "^0.60.22",
     "@types/react-test-renderer": "16.9.0",
+    "@typescript-eslint/parser": "^2.7.0",
     "babel-jest": "^24.9.0",
+    "eslint": "^6.6.0",
     "jest": "^24.9.0",
     "metro-react-native-babel-preset": "^0.56.0",
     "react-test-renderer": "16.9.0",