Please fork the repository, make your changes, commit them and then create a pull request in the original repository.
Also please keep the structure:
- Put different sections into different files and
\input
them from thecontents.tex
file. - Break lines at 80 columns. (Preferable: Lines that should continue to the next line should be broken at 80 columns with a whitespace as final character.)
Keep the general file structure outlined in README.md, this makes the material more modular and compatible.