docs(README.md): add link to Angular 2 repo
docs(README.md): add link to Angular 2 repo

Might be helpful for those completely new to Angular in general, that intended to view the upcoming
2.0 version.

Closes #14532

Real-Currents/angular.js,Real-Currents/angular.js,Real-Currents/angular.js,Real-Currents/angular.js