Add pysdl2 to the trainmodel dependencies so I'll be able to visualize what's going on.

Dependencies

• [2] QBDHX7BH Add a makefile to express python dependencies since pipenv doesn't like tensorflow
• [3] MPLEC4W3 Switch license to one I like more.

Change contents

• edit in trainmodel/Makefile at line 7
  [2.165]
  + env PATH=$(PWD)/venv/bin:$(PATH) pip install pysdl2

  +