Update README.md

create license

added documentation

First commit with GPL License | Improved overall user friendliness

window moves with playback + export midi at different speeds

added option to write midi at different speed

update requirements.txt

simplified

added: insert bar on current playback position, start at different blackback position, option to reset all bars in menu

added the ability to insert/move/delete bars in view 1 & 3

added project header

reordered class names

added option to load app without sample data

added parent class for views

added the ability to start a song at any position