First commit of README.md.
Add .gitignore.

- Ignore object files (*.o).
Add a change that will be reverted.
Revert "Add a change that will be reverted."

This reverts commit 16af4b6ce6430d01f339b3413960d3ea7f1fe298.
Merge remote-tracking branch 'origin/master'

Conflicts:
	README.md