CB-6491 add CONTRIBUTING.md
CB-6491 add CONTRIBUTING.md

alsorokin/cordova-plugin-battery-status,Maria02/camera,apache/cordova-plugin-battery-status,revolunet/cordova-plugin-battery-status,gmegidish/cordova-plugin-battery-status,blackberry-webworks/cordova-plugin-battery-status,Maria02/camera,gmegidish/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,gmegidish/cordova-plugin-battery-status,Cappada/cordova-plugin-battery-status,blackberry-webworks/cordova-plugin-battery-status,Cappada/cordova-plugin-battery-status,Cappada/cordova-plugin-battery-status,Maria02/camera,corimf/cordova-plugin-battery-status,revolunet/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,blackberry-webworks/cordova-plugin-battery-status,purplecabbage/cordova-plugin-battery-status,gmegidish/cordova-plugin-battery-status,apache/cordova-plugin-battery-status,corimf/cordova-plugin-battery-status,Uldax/cordova-plugin-battery-status,Uldax/cordova-plugin-battery-status,revolunet/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,purplecabbage/cordova-plugin-battery-status,purplecabbage/cordova-plugin-battery-status,purplecabbage/cordova-plugin-battery-status,apache/cordova-plugin-battery-status,Uldax/cordova-plugin-battery-status,Maria02/camera,Cappada/cordova-plugin-battery-status,Uldax/cordova-plugin-battery-status,corimf/cordova-plugin-battery-status,blackberry-webworks/cordova-plugin-battery-status,revolunet/cordova-plugin-battery-status,corimf/cordova-plugin-battery-status