added a first draft of MI Json schema
added a first draft of MI Json schema

MICommunity/interaction-viewer,colin-combe/ComplexViewer,colin-combe/ComplexViewer,colin-combe/MI-model,colin-combe/interaction-viewer,MICommunity/ComplexViewer,colin-combe/MI-model,colin-combe/interaction-viewer,colin-combe/MI-model,MICommunity/interaction-viewer,MICommunity/ComplexViewer,MICommunity/interaction-viewer