certificates section added

There is no section that I could write my certificates into. There is an "education" section, however, it refers to the courses I have taken during my college/uni studies. And where shall I put a foreign language certificate? Or a Microsoft .Net Developer certificate? Below is my suggestion for adding `certificate` section.

I can see there is schema.json.html file that is generated, basing on schema.json file. Unfortunately, I don't know the tool that has been used to generate the .html file. Please provide information, so that I can do it (besides: how about adding it to README?)