chore: add an example for SSR (#8298)

<img width="740" alt="Screen Shot 2020-05-20 at 16 31 30" src="https://user-images.githubusercontent.com/1174278/82458770-673d8880-9ab7-11ea-81d3-8ac0c1e52705.png">

example/package.json

@@ -9,6 +9,7 @@
     "native": "react-native start",
     "android": "react-native run-android",
     "ios": "react-native run-ios",
+    "server": "nodemon -e '.js,.ts,.tsx' --exec \"babel-node -i '/node_modules[/\\](?react-native)/' -x '.web.tsx,.web.ts,.web.js,.tsx,.ts,.js' --config-file ./server/babel.config.js server\"",
     "test": "jest"
   },
   "dependencies": {
@@ -18,6 +19,7 @@
     "expo": "^37.0.8",
     "expo-asset": "~8.1.3",
     "expo-blur": "~8.1.0",
+    "koa": "^2.12.0",
     "react": "~16.9.0",
     "react-dom": "~16.9.0",
     "react-native": "~0.61.5",
@@ -29,17 +31,28 @@
     "react-native-screens": "^2.7.0",
     "react-native-tab-view": "2.14.0",
     "react-native-unimodules": "~0.9.1",
+    "react-native-vector-icons": "^6.6.0",
     "react-native-web": "^0.11.7"
   },
   "devDependencies": {
+    "@babel/node": "^7.8.7",
     "@expo/webpack-config": "^0.11.19",
+    "@types/cheerio": "^0.22.18",
     "@types/jest-dev-server": "^4.2.0",
+    "@types/koa": "^2.11.3",
+    "@types/node-fetch": "^2.5.7",
     "@types/react": "^16.9.34",
+    "@types/react-dom": "^16.9.8",
     "@types/react-native": "^0.62.7",
+    "babel-plugin-module-resolver": "^4.0.0",
     "babel-preset-expo": "^8.1.0",
+    "cheerio": "^1.0.0-rc.3",
     "expo-cli": "^3.20.1",
     "jest": "^26.0.1",
     "jest-dev-server": "^4.4.0",
+    "mock-require-assets": "^0.0.1",
+    "node-fetch": "^2.6.0",
+    "nodemon": "^2.0.4",
     "playwright": "^0.14.0",
     "serve": "^11.3.0",
     "typescript": "^3.8.3"