chore: readme atualizado

README.md

 # NotificationDispatcher
 
-**TODO: Add description**
+This lib is used to send notification events to a rabbitmq queue server. It contains methods 
+to create the necessary database structures, for example the notification_messages table or
+the devices table to store the tokens necessary for push notification.
 
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+[Available in Hex](https://hex.pm/packages/notification_dispatcher), this package can be installed
 by adding `notification_dispatcher` to your list of dependencies in `mix.exs`:
 
 ```elixir
 def deps do
   [
-    {:notification_dispatcher, "~> 0.1.0"}
+    {:notification_dispatcher, "~> 0.1.3"}
   ]
 end
 ```
 
-Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
-and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
-be found at [https://hexdocs.pm/notification_dispatcher](https://hexdocs.pm/notification_dispatcher).
+Create the following config on your project:
+```elixir
+config :notification_dispatcher,
+       rabbitmq_host: "localhost",
+       rabbitmq_username: "guest",
+       rabbitmq_password: "guest",
+       repo: MyApp.Repo    
+```
+
+To store your notification_messages templates you need a migration that calls the following method:
+```elixir
+  import NotificationDispatcher.Migration
+
+  def change do
+    create_notification_messages()
+  end
+```
+
+If your project requires push notifications by using firebase you need to crate a migration
+that calls the following method:
+```elixir
+  import NotificationDispatcher.Migration
+
+  def change do
+    create_notification_messages()
+  end
+```
+
+You can use the following method to register notification templates on your database:
+```elixir
+alias NotificationDispatcher.Controller.NotificationMessageController
+
+NotificationMessageController.create(
+  %{
+    "title" => "title",
+    "message" => "message",
+    "notification_type" => 0,
+    "channel" => 0,
+    "locale" => "en",
+    "dispatch_offsets" => "[0]"
+  }
+)
+```
 
+This method can return:
+```elixir
+{:ok, notification_message, json}
+``` 
+or
+```elixir
+{:error, changeset}
+```         
+
+You can use the following method to create user_devices if your project requires it:
+```elixir
+alias NotificationDispatcher.Context.NotificationContext
+
+NotificationContext.create_device(
+  %{
+    "device_token" => "firebase_token_of_user",
+    "os" => "android"
+  },
+  user_id
+)
+```
+
+If you have the necessity you can also get all devices by user by using the following method:
+```elixir
+alias NotificationDispatcher.Context.NotificationContext
+
+NotificationContext.get_devices(user_ids)
+```
+
+To send a notification event to the rabbitmq queue you can call the following method:
+```elixir
+alias NotificationDispatcher.Service.NotificationService
+
+NotificationService.send_notification(
+  user_id, 
+  device_token_or_email, 
+  notification_type, 
+  params, 
+  language, 
+  device_id
+)
+```