Add base files

bigbluebutton-html5/imports/api/2.0/screenshare/index.js

...html5/imports/api/2.0/screenshare/server/eventHandlers.js

...s/api/2.0/screenshare/server/handlers/broadcastStarted.js

.../2.0/screenshare/server/handlers/broadcastStartedVoice.js

...s/api/2.0/screenshare/server/handlers/broadcastStopped.js

.../2.0/screenshare/server/handlers/broadcastStoppedVoice.js

...ports/api/2.0/screenshare/server/handlers/startedVoice.js

...ports/api/2.0/screenshare/server/handlers/stoppedVoice.js

...ebutton-html5/imports/api/2.0/screenshare/server/index.js

...utton-html5/imports/api/2.0/screenshare/server/methods.js

...on-html5/imports/api/2.0/screenshare/server/publishers.js

bigbluebutton-html5/server/main.js