refactor: move angular source to /packages rather than modules/@angular

packages/router/README.md

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+Angular Router
+=========
+
+Managing state transitions is one of the hardest parts of building applications. This is especially true on the web, where you also need to ensure that the state is reflected in the URL. In addition, we often want to split applications into multiple bundles and load them on demand. Doing this transparently isn’t trivial.
+
+The Angular router is designed to solve these problems. Using the router, you can declaratively specify application state, manage state transitions while taking care of the URL, and load components on demand.
+
+## Overview
+Read the overview of the Router [here](https://vsavkin.com/angular-2-router-d9e30599f9ea).
+
+## Guide
+Read the dev guide [here](https://angular.io/docs/ts/latest/guide/router.html).
+
+## Local development
+
+```
+# keep @angular/router fresh
+$ ./scripts/karma.sh
+
+# keep @angular/core fresh
+$ ../../../node_modules/.bin/tsc -p modules --emitDecoratorMetadata -w
+
+# start karma
+$ ./scripts/karma.sh
+```