Basic setup for working with oled with nerves (SSD1306 128x32)

oled.mdlive

# OLED

```elixir
Mix.install([
  :oled,
  :chisel
])
```

## Basic setup

```elixir
Circuits.I2C.detect_devices()
```

Create a display module

```elixir
defmodule MyApp.MyDisplay do
  use OLED.Display, app: :my_app
end
```

Add the configuration

```elixir
Application.put_env(:my_app, MyApp.MyDisplay,
  device: "i2c-1",
  driver: :ssd1306,
  type: :i2c,
  width: 128,
  height: 32,
  rst_pin: 25,
  dc_pin: 24,
  address: 0x3C
)
```

```elixir
{:ok, pid} = MyApp.MyDisplay.start_link([])
```

```elixir
MyApp.MyDisplay.clear()

# Draw something
MyApp.MyDisplay.rect(0, 0, 127, 31)
MyApp.MyDisplay.line(0, 0, 127, 31)
MyApp.MyDisplay.line(0, 31, 127, 0)

# Display it!
MyApp.MyDisplay.display()
```