### Gleam OTP Actor Example

Source: https://hexdocs.pm/gleam_otp/v1.2.0/gleam_otp/index

Demonstrates the creation and usage of a simple actor in Gleam using the OTP library. It shows how to start an actor, send messages, and receive replies, ensuring type safety and compatibility with Erlang's OTP.

```gleam
import gleam/erlang/process.{type Subject}
import gleam/otp/actor

pub fn main() {
  // Start an actor
  let assert Ok(actor) = 
    actor.new(0)
    |> actor.on_message(handle_message)
    |> actor.start

  // Send some messages to the actor
  actor.send(actor.data, Add(5))
  actor.send(actor.data, Add(3))

  // Send a message and get a reply
  assert actor.call(actor.data, waiting: 10, sending: Get) == 8
}

pub fn handle_message(state: Int, message: Message) -> actor.Next(Int, Message) {
  case message {
    Add(i) -> {
      let state = state + i
      actor.continue(state)
    }
    Get(reply) -> {
      actor.send(reply, state)
      actor.continue(state)
    }
  }
}

pub type Message {
  Add(Int)
  Get(Subject(Int))
}
```

--------------------------------

### Add gleam_otp Dependency

Source: https://hexdocs.pm/gleam_otp/v1.2.0/gleam_otp/index

Installs the gleam_otp library version 1.0.0 into the current Gleam project. This command is used to add the library as a dependency for future use in the project.

```bash
gleam add gleam_otp@1
```

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