I'm not clear quite what you want to do with this PCB. Are you sure it's not already in the library? Try clicking on the Libraries button then search for "feather lora" in the Search Libraries tool. A) If you just want to make a PCB footprint for it so that you can place it onto or plug it into another PCB then you just need the board dimensions as in the link below but with more detail of the hole diameters for the two rows of pins down the long sides. You will also need to make a Schematic Symbol for it based on the pins on the Eagle schematic Create and uniquely name the footprint first and then the symbol. Give the symbol the same name as the footprint and also assign this name to the Package attribute of the schematic symbol. [https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module/downloads](https://learn.adafruit.com/adafruit-feather-m0-radio-with-lora-radio-module/downloads) B) If you want to create your own version of this PCB then you should be able to import the Eagle files: [https://github.com/adafruit/Adafruit-Feather-M0-RFM-LoRa-PCB/blob/master/Adafruit%20Feather%20M0%20RFMxx.brd](https://github.com/adafruit/Adafruit-Feather-M0-RFM-LoRa-PCB/blob/master/Adafruit%20Feather%20M0%20RFMxx.brd) and: [https://github.com/adafruit/Adafruit-Feather-M0-RFM-LoRa-PCB/blob/master/Adafruit%20Feather%20M0%20RFMxx.sch](https://github.com/adafruit/Adafruit-Feather-M0-RFM-LoRa-PCB/blob/master/Adafruit%20Feather%20M0%20RFMxx.sch) into EasyEDA. See: [https://docs.easyeda.com/en/Import/Import-Eagle/index.html](https://docs.easyeda.com/en/Import/Import-Eagle/index.html) You can also use page given above to check the schematic and major dimensions. Where you may come unstuck is if you need any symbols that are not already in the EasyEDA libraries or included with the Eagle schematic file. I've never used Eagle so I am unfamiliar with this aspect of importing Eagle files.