Added drone doc

doc/drone/drone.md

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+# `Faker::Drone`
+
+```ruby
+# Aircraft Properties
+Faker::Drone.name                   #=> "DJI Mavic Air 2"
+Faker::Drone.weight                 #=> "570g"
+Faker::Drone.max_ascent_speed       #=> "4m/s"
+Faker::Drone.max_descent_speed      #=> "3m/s"
+Faker::Drone.flight_time            #=> "34Mins"
+Faker::Drone.max_altitude           #=> "5000m"
+Faker::Drone.max_flight_distance    #=> "18500m"
+Faker::Drone.max_speed              #=> "19m/s"
+Faker::Drone.max_wind_resistance    #=> "10.5m/s"
+Faker::Drone.max_angular_velocity   #=> "250º/s"
+Faker::Drone.max_tilt_angle         #=> "35º"
+Faker::Drone.operating_temprature   #=> "14º-104ºF"
+
+# Battery Properties
+Faker::Drone.battery_capacity       #=> "3500mAh"
+Faker::Drone.battery_voltage        #=> "13.2V"
+Faker::Drone.battery_type           #=> "LiPo 4S"
+Faker::Drone.battery_weight         #=> "198g"
+Faker::Drone.charging_temprature    #=> "41º-104ºF"
+Faker::Drone.max_charging_power     #=> "38W"
+
+# Camera Properties
+Faker::Drone.iso                    #=> "100-3200"
+Faker::Drone.max_resolution         #=> "48MP
+Faker::Drone.photo_format           #=> "JPEG"
+Faker::Drone.video_format           #=> "MP4"
+Faker::Drone.shutter_speed          #=> "8-1/8000s"
+```
+
+### Faker::Drone.model
+
+This will return the model with all above drone properties, to insure that all drone properties are valid for particular model
+
+```ruby
+model = Faker::Drone.model
+model.name              #=> "DJI Mavic Air"
+model.battery_capacity  #=> "2375mAh"
+model.max_resolution    #=> "12MP"
+```