For PlatformIO add `library.json`. Use [PREi's](https://github.com/fulf/prei/blob/master/library.json) as an example. For Arduino add `library.properties` and `keywords.txt`. As above, use PREi's [library](https://github.com/fulf/prei/blob/master/library.properties) and [keywords](https://github.com/fulf/prei/blob/master/keywords.txt) files as an example.
For PlatformIO add
library.json. Use PREi's as an example.For Arduino add
library.propertiesandkeywords.txt. As above, use PREi's library and keywords files as an example.