message: Add PlatformIO installation docs
diff: @@ -29,7 +29,7 @@ First attempt at a library. Lots more changes and fixes to do. Contributions are
  - Installing
  - [Arduino - Through Library Manager](#install-through-library-manager)
  - [Arduino - From Github](#checkout-from-github)
  - - [PlatformIO]
  + - [PlatformIO](#install-using-platformio)
  - [Using](#using)
  - [Documentation](#documentation)
  - [Access Point Password](#password-protect-the-configuration-access-point)
  @@ -147,6 +147,31 @@ While in AP mode, connect to it then open a browser to the gateway IP, default 1
  Also see [examples](https://github.com/tzapu/WiFiManager/tree/master/examples).
  +#### Install Using PlatformIO
  +
  +[PlatformIO](https://platformio.org/) is an emerging ecosystem for IoT development, and
  +is an alternative to using the Arduino IDE. Install `WiFiManager`
  +using the platformio [library manager](https://docs.platformio.org/en/latest/librarymanager/index.htm) in your editor,
  +or using the [PlatformIO Core CLI](https://docs.platformio.org/en/latest/userguide/demo.html#library-manager),
  +or by adding it to your `platformio.ini` as shown below (recommended approach).
  +
  +The simplest way is to open the `platformio.ini` file at the root of your project, and `WifiManager` to the common top-level env
  +`lib_deps` key like so:
  +
  +```
  +[env]
  +lib_deps =
  + WiFiManager
  +```
  +
  +If you want to install the development branch, then you'll need to use the `repository#tag` format instead:
  +
  +```
  +[env]
  +lib_deps =
  + https://github.com/tzapu/WiFiManager.git#development
  +```
  +
  ## Documentation
  #### Password protect the configuration Access Point
  