add chapter
move text to limitations section
more limitations
clearer formatting
typo
remote repo limitation
explain the repository observer
rearrange in order
add dispatcher chapter
add test runner section
add diagram
fix typo
add extensibility chapter
Add information about how to run the CI
fix typos
add a conclusion
Added a project note
Merge branch 'master' of https://github.com/aosabook/500lines into chapter
Improve introduction
added an addtional suggested improvement