docs: usage

README.md

@@ -8,20 +8,52 @@ A simple report-to-Slack reporter for [Tower](https://github.com/mimiquate/tower
 
 ## Installation
 
-If [available in Hex](https://hex.pm/docs/publish), the package can be installed
-by adding `tower_slack` to your list of dependencies in `mix.exs`:
+The package can be installed by adding `tower_slack` to your list of dependencies in `mix.exs`:
 
 ```elixir
+# mix.exs
+
 def deps do
   [
     {:tower_slack, "~> 0.1.0"}
   ]
 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/tower_slack>.
+## Usage
+
+```elixir
+# config/config.exs
+
+config(
+  :tower,
+  :reporters,
+  [
+    # along any other possible reporters
+    TowerRollbar.Reporter
+  ]
+)
+```
+
+```elixir
+# config/runtime.exs
+
+config :tower_rollbar,
+  enabled: config_env() == :prod,
+  access_token: System.get_env("ROLLBAR_SERVER_ACCESS_TOKEN"),
+  environment: System.get_env("DEPLOYMENT_ENV", to_string(config_env()))
+```
+
+```elixir
+# lib/<your_app>/application.ex
+
+defmodule YourApp.Application do
+  def start(_type, _args) do
+    Tower.attach()
+
+    # rest of your code
+  end
+```
 
 ## License