Add category to Wire/library.properties

Author: erik.nyquist

libraries/Wire/library.properties

@@ -7,4 +7,5 @@ sentence=This library allows you to communicate with I2C and Two Wire Interface
 paragraph=This library is compatible with Curie Core. It allows the communication with I2C devices like temperature sensors, realtime clocks and many others using SDA (Data Line) and SCL (Clock Line).
 url=http://makers.intel.com
 architectures=arc32
+category=Communication
 core-dependencies=arduino (>=1.6.3)