Addition of DWA

[UseTheForce007]

I would like to propose an addition of Dynamic window approach. It's an algorithm I've recently worked on in c++ and can recreate it in python for this repo. It is a relatively simple algorithm to understand as well for beginners.

[ShisatoYano]

Thank you for proposing! You can try adding a new sample program of DWA refer to the following existing code.

For example,
Rear wheel feedback controller as a controller module.
Rear wheel feedback path tracking simulator as a path tracking simulation executor by Rear wheel feedback controller.
You need to create a working branch, implement the code and unit test and send a PR to me refer to contribution document.

If you have any questions, please ask me here.