Please add documentation

[markushunter]

I'm having trouble reproducing this work. If you could add the following documentation, it would be greatly appreciated:

• What python version you are running
• Where to acquire the test dataset(s). The file structure in MOT17 did not match the one hardcoded in the example config.
• Full examples of how to recreate results shown in the paper.

[alanzty]

Hi, the work is built on top of mmtrack. Please follow the documentation there to setup the test dataset.

I used python 3.7. But it should work with other python 3 versions as well. The dependencies are listed in the readme.