added tiktokbot and django-sql-tutorial

added a new django tutorial series and merged the old tutorial into the new folder

updated testing tutorial

a

updated sb3 tutorials

updated a2c

updated change_case.py

created pybullet tutorial and optimized convert_case.py so it won't change method name

changed files names to be more constant with others

added license header

added license header

n

added requirements.txt

added a few more rl tutorials and reformat some code

added some save features and modified the endgame reward function a little