feat(windows): add example app (#1937)

Added example app for Windows

Example/metro.config.js

@@ -7,7 +7,12 @@ const pack = require('../package.json');
 
 const root = path.resolve(__dirname, '..');
 
-const modules = [...Object.keys(pack.peerDependencies)];
+const fs = require('fs');
+const rnwPath = fs.realpathSync(
+  path.resolve(require.resolve('react-native-windows/package.json'), '..'),
+);
+
+const modules = [...Object.keys(pack.peerDependencies), 'react-native-windows'];
 
 module.exports = {
   projectRoot: __dirname,
@@ -20,6 +25,15 @@ module.exports = {
       modules.map(
         m => new RegExp(`^${escape(path.join(root, 'node_modules', m))}\\/.*$`),
       ),
+      // This stops "react-native run-windows" from causing the metro server to
+      // crash if its already running
+      new RegExp(
+        `${path.join(__dirname, 'windows').replace(/[/\\]+/g, '/')}.*`,
+      ),
+      // This prevents "react-native run-windows" from hitting: EBUSY: resource busy or locked, open msbuild.ProjectImports.zip or other files produced by msbuild
+      new RegExp(`${rnwPath}/build/.*`),
+      new RegExp(`${rnwPath}/target/.*`),
+      /.*\.ProjectImports\.zip/,
     ),
 
     extraNodeModules: modules.reduce((acc, name) => {