Changes look good. Result can be viewed here: https://github.com/KonradIT/Arduino/blob/master/README.mkdn

Two remarks though:

• It seems more common to use "README.md" instead of "README.mkdn", perhaps you could use that?
• These two commits really are one logical change, so they should be squashed together.

If you agree and want to change those things, please make the changes and do a force push to update this pullrequest (e.g., don't open a new pullrequest just for this).

I have pushed readme.md !

Cool!
Could you also squash together all commits? If you haven't done this before - interactive rebase is probably the best (short-short-version: run git rebase -i origin/master and in the editor you get, replace the pick for the last two commits with fixup or just f). You might want to read up on (interactive) rebase, since it is totally awesome! :-)