added example API class.
added example API class.

felliott/scrapi,alexgarciac/scrapi,fabianvf/scrapi,CenterForOpenScience/scrapi,CenterForOpenScience/scrapi,erinspace/scrapi,mehanig/scrapi,icereval/scrapi,mehanig/scrapi,ostwald/scrapi,fabianvf/scrapi,erinspace/scrapi,felliott/scrapi,jeffreyliu3230/scrapi