ELF VRDrone Base Guards

This is base guards for ELF VRDrone, specifically for beginners to resist drop or crashes. Pro players better not use the guards because added weight surely has impact on the flight performance: the lighter the drone is, the easier to take off and shuttle back and forth.

Relevant ELF VRDrone information please refer to: https://www.indiegogo.com/projects/elf-the-hd-video-streaming-nano-drone/x/7648351#/story