docs: add basic monorepo readme

Author: smithad15

README.md

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+# @angular-redux
+
+[Redux](https://redux.js.org/) bindings for [Angular](https://angular.io/) applications.
+
+## Packages
+
+- [@angular-redux/store](packages/store) - Bindings between Redux and Angular
+- [@angular-redux/form](packages/form) - Bindings between Angular Forms and your Redux state
+- [@angular-redux/router](packages/router) - Bindings between Angular Router and your Redux state
+
+## Examples
+
+- [Example Application](packages/example-app)