Update readme

Author: marcelolx

README.md

@@ -1,5 +1,44 @@
-# rails-fetch
+# Rails Fetch
+
+Rails Fetch encapsulates the logic to send by default some headers that are required by rails applications like the `X-CSRF-Token`.
+
+# Install
+
+### npm
+```
+npm i rails-fetch
+```
+### yarn
+```shell
+yarn add rails-fetch
+```
+
+# How to use
+
+Just import the `Request` class from the package and instantiate it passing the request `method`, `url`, `options`,  then call `await request.perform()` and do what do you need with the response.
+
+Example:
+
+```js
+import { Request } from 'rails-fetch'
+
+....
+
+async myMethod () {
+  const request = new Request('post', 'localhost:3000/my_endpoint', { body: { name: 'Rails Fetch' }})
+  const response = await request.perform()
+  if (response.ok) {
+    const body = await response.text
+    // Do whatever do you want with the response body
+    // You also are able to call `response.html` or `response.json`, be aware that if you call `response.json` and the response contentType isn't `application/json` there will be raised an error.
+  }
+}
+```
 
 # Credits
 
-[Basecamp](https://github.com/basecamp), since this piece of code has been extracted from hey.com.
+[Basecamp](https://github.com/basecamp), since this piece of code has been extracted from hey.com.
+
+# License
+
+Rails Fetch is released under the [MIT License](LICENSE).