Submit jekyll-theme-panda

[sorphwer]

Submit md file and thumbnail of theme jekyll-theme-panda

I've been polishing and using this theme for over 2 years, and I would like to submit and share this theme. Feel free to check the showcase: showcase version history

my own blog using this theme

The updated repo has been tested in my machine but I changed the markdown engine into kramdown rather than rdiscount and I hope it should be fine.