Add React Native examples app

RNTester examples taken from React Native 0.55.4.

Minor changes to disable / enable some examples for the web.

packages/examples/package.json

@@ -0,0 +1,23 @@
+{
+  "private": true,
+  "name": "react-native-examples",
+  "version": "0.7.3",
+  "scripts": {
+    "build": "mkdir -p dist && cp -f src/index.html dist/index.html && ./node_modules/.bin/webpack-cli --config ./webpack.config.js",
+    "release": "yarn build && git checkout gh-pages && rm -rf ../../examples && mv dist ../../examples && git add -A && git commit -m \"Examples deploy\" && git push origin gh-pages && git checkout -"
+  },
+  "dependencies": {
+    "babel-runtime": "^6.26.0",
+    "react": "^16.3.2",
+    "react-dom": "^16.3.2",
+    "react-native-web": "0.7.3"
+  },
+  "devDependencies": {
+    "babel-plugin-react-native-web": "0.7.3",
+    "babel-plugin-transform-runtime": "^6.23.0",
+    "file-loader": "^1.1.11",
+    "webpack": "^4.8.1",
+    "webpack-bundle-analyzer": "^2.11.1",
+    "webpack-cli": "^2.1.3"
+  }
+}