Add documentation for liferay-npm-bundler plugins

packages/liferay-npm-bundler-plugin-inject-angular-dependencies/README.md

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+# liferay-npm-bundler-plugin-inject-angular-dependencies
+
+> Inject some peer dependencies which are needed to make Angular work.
+
+## Installation
+
+```sh
+npm install --save-dev liferay-npm-bundler-plugin-inject-angular-dependencies
+```
+
+## Usage
+
+Add the following to your `.npmbundlerrc` file:
+
+```json
+{
+ "*": {
+ "plugins": [
+ "inject-angular-dependencies"
+ ]
+ }
+}
+```
+
+## Technical Details
+
+This plugin injects a dependency on `rxjs` in `@angular/forms` package. This is
+needed for Angular to work correctly under Liferay Portal npm architecture.
+
+To determine the version of `rxjs` to use, the plugin scans the parent directory
+of `@angular/forms` for the `rxjs` package.
+
+You can find more information about what happens with `rxjs` and 
+`@angular/forms` in 
+[this issue](https://github.com/angular/angular/issues/17917).

packages/liferay-npm-bundler-plugin-replace-browser-modules/README.md

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+# liferay-npm-bundler-plugin-replace-browser-modules
+
+> Replace modules listed under `browser` section of `package.json` files.
+
+## Installation
+
+```sh
+npm install --save-dev liferay-npm-bundler-plugin-replace-browser-modules
+```
+
+## Usage
+
+Add the following to your `.npmbundlerrc` file:
+
+```json
+{
+ "*": {
+ "plugins": [
+ "replace-browser-modules"
+ ]
+ }
+}
+```
+
+## Technical Details
+
+This plugin scans `package.json` for a browser entry and copies browser modules
+on top of server modules or deletes them when set to `false`.
+
+Please read the 
+[`browser` field specification](https://github.com/defunctzombie/package-browser-field-spec) 
+for more information.
+