Add library properties

Signed-off-by: fpr <fabien.perroquin@wi6labs.com>

Author: fpr

library.properties

@@ -0,0 +1,9 @@
+name=STM32duino RTC
+version=1.0.0
+author=Wi6Labs
+maintainer=stm32duino
+sentence=Allows to use the RTC functionalities. For STM32 boards.
+paragraph=With this library you can use the RTC peripheral in order to program actions related to date and time.
+category=Timing
+url=https://github.com/stm32duino/STM32RTC.git
+architectures=stm32