Please add support for Purplepoint boards

[bergdahl]

• [X ] Development Platform or Board.

Arduino compatible boards - https://github.com/m2m-solutions/board-index/blob/master/package_purplepoint.cloud_index.json

[ivankravets]

Please find the similar boards to your and make PRs:

AVR

1. variant to https://github.com/platformio/platformio-pkg-framework-arduinoavr
2. Boards manifest to https://github.com/platformio/platform-atmelavr/tree/develop/boards

SAM

1. variant to https://github.com/platformio/platformio-pkg-framework-arduinosam
2. Boards manifest to https://github.com/platformio/platform-atmelsam/tree/develop/boards

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You can test changes on your machine. Files are located in ~/.platformio/packages/framework-arduino... and ~/.platformio/platforms/atmel...