[control] 2d flat quadruped robot (trot gait)

[kirillin]

1. choose any simulator and fix 3 dof to make control 2d
2. task (see details on ticket title)

• robot and env -- flat quadruped robot
• goal -- run with maximum speed
• algorithm -- any

4. implementation requirements
   ./examples/quadrotor_drone/sim/ add env files of robot and env
   ./examples/quadrotor_drone/control/ add controller
   use any simulator-controller communication protocol

5. example of implementation https://github.com/pets-tech/mysegway_mujoco