Add godot_rl label

[GeorgeS2019]

Do consider adding Godot RL label to track all your projects or user contributed projects using this godot rl framework

[GeorgeS2019]

The Unity Machine Learning Agents Toolkit (ML-Agents)

ml-agents

The Godot Reinforcement Learning Agents Toolkit (Godot-RL-Agents)

godot-rl-agents

[GeorgeS2019]

Once we promoted this library to the Godot community, we need to give an overview of the ml-agents use cases have yet to be ported to Godot from Unity