Add matcha.css

[dimitrismistriotis]

Added a similar framework using previous entry as template.

[bblanchon]

Matcha seems like a good candidate.
Why this PR wasn't accepted?

[troxler]

OP closed the PR.

After a quick glance, though, two things stand out.

1. Their website is not responsive, on smaller screens there is horizontal scrolling. The culprit seems to be their styling for code that neither adds a scrollbar on itself nor breaks long words.
2. Their forms have ultra low contrast. Especially their radio buttons and checkboxes are really bad.

[dimitrismistriotis]

I closed it because it was open for months (!) with no response, the fact that we discuss it now one year later seems really odd.