Create library.json

[eyal-rounds]

add library.json so it can be donated to platformio registry

Thank you for creating a pull request to contribute to Adafruit's GitHub code! Before you open the request please review the following guidelines and tips to help it be more easily integrated:

• Describe the scope of your change--i.e. what the change does and what parts of the code were modified. This will help us understand any risks of integrating the code.

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• Please run any tests or examples that can exercise your modified code. We strive to not break users of the code and running tests/examples helps with this process.

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After reviewing the guidelines above you can delete this text from the pull request.

[eyal-rounds]

Didn't change the code, i did added library.json based on ASF Core library.property plus the knowledge this library depend on it. Once merged i'll request platformio to register this (your)repo.

[per1234]

Note that the existing library.properties file can be used instead of library.json for inclusion in the PlatformIO library registry.

In fact, the library is now in the registry (not my doing): https://platformio.org/lib/show/2046/Adafruit%20ZeroTimer%20Library

[ladyada]

yah platformio does the right thing, closing!