Add pull request template.
Add pull request template.

apache/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,apache/cordova-plugin-battery-status,apache/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status,alsorokin/cordova-plugin-battery-status