Update reademe

Author: marcelolx

README.md

@@ -0,0 +1,27 @@
+# Request.JS for Rails
+
+[Rails Request.JS](https://github.com/rails/request.js) encapsulates the logic to send by default some headers that are required by rails applications like the `X-CSRF-Token`.
+
+## Installation
+
+1. Add the `requestjs-rails` gem to your Gemfile: `gem 'requestjs-rails'`
+2. Run `./bin/bundle install`.
+3. Run `./bin/rails requestjs:install`
+
+If using the asset pipeline to manage JavaScript, the last command will:
+
+- Append import "@rails/request.js" to your app/assets/javascripts/application.js entrypoint.
+
+Make sure you've already installed `importmap-rails` and that it's referenced before `requestjs-rails` in your Gemfile.
+
+If using Webpacker to manage JavaScript, the last command will:
+
+- Install the Request.JS NPM package.
+
+## Usage
+
+With the installation done check the documentation in the [Rails Request.JS](https://github.com/rails/request.js#how-to-use) repository.
+
+## License
+
+Request.JS for Rails is released under the [MIT License](https://opensource.org/licenses/MIT).