Hacktoberfest 2020: Conway's Game of Life (#3070)

* Created conways_game_of_life.py

* Added new_generation(list[int[int]]) -> list[list[int]]

* Added glider example

* Added comments and shortened glider example

* Fixed index out of bounds error

* Added test

* Added blinker example

* Added ability to generate images

* Moved image generating code into a separate function

* Added comments

* Comment

* Reformatted file

* Formatting

* Removed glider test

* Update cellular_automata/conways_game_of_life.py

Co-authored-by: John Law <johnlaw.po@gmail.com>

* Update conways_game_of_life.py

* Update conways_game_of_life.py

Co-authored-by: John Law <johnlaw.po@gmail.com>