Create markdown-cn.html.markdown

initiate
Updated the file head
Update markdown-cn.html.markdown
2nd para
halfway
Finally Done
Proofread and checked style
typo correction
Footnote corrected
Update markdown-cn.html.markdown
Changed filename
updated the filename into learnmarkdown-cn.md
Couple changes to C to close https://github.com/adambard/learnxinyminutes-docs/pull/594
Add lua-cn filename to close https://github.com/adambard/learnxinyminutes-docs/pull/610/files
Add traditional for loop bash example to close https://github.com/adambard/learnxinyminutes-docs/pull/654
Merge pull request #666 from FZSS/master

[markdown/zh-cn] Chinese Translation for Markdown
Merge master branch 'upstream/master'