Added app-helloworld as a clickable  sample app.
Added app-helloworld as a clickable  sample app.

billappleton/dsp-core,neroxing/dsp-core,neroxing/dsp-core,bbreck3/dsp-core,neroxing/dsp-core,billappleton/dsp-core,billappleton/dsp-core,bbreck3/dsp-core,bbreck3/dsp-core,bbreck3/dsp-core,neroxing/dsp-core,billappleton/dsp-core