added Steps to write permission dict

RCTAppleHealthKit/RCTAppleHealthKit+TypesAndPermissions.m

@@ -40,6 +40,8 @@
         @"BodyFatPercentage" : [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyFatPercentage],
         @"BodyMassIndex" : [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyMassIndex],
         @"LeanBodyMass" : [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierLeanBodyMass],
+
+        @"Steps" : [HKObjectType quantityTypeForIdentifier:HKQuantityTypeIdentifierStepCount],
     };
     return writePerms;
 }