Added library.properties

library.properties

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+name=EButton
+version=1.1.0
+author=Arsen Torbarina <jonniezg@gmail.com>
+maintainer=Arsen Torbarina <jonniezg@gmail.com>
+sentence=A compact, simple-to-use, reliable and powerful event-driven button library, with proper debouncing and fine grained event structure. 
+paragraph=Supported events are TRANSITION, EACH_CLICK, DONE_CLICKING, SINGLE_CLICK, DOUBLE_CLICK, LONG_PRESS_START, DURING_LONG_PRESS and LONG_PRESS_END. Unneeded features can be disabled in compile-time to minimize footprint. All the timings can be easily configured.
+category=Signal Input/Output
+url=https://github.com/jonnieZG/EButton
+architectures=*