added squat-radar-calendar-integration

...s/squat-radar-calendar-integration/assets/squat-radar.css

...ns/squat-radar-calendar-integration/assets/squat-radar.js

...nt/plugins/squat-radar-calendar-integration/composer.json

...r-calendar-integration/includes/squat-radar-connector.php

...r-calendar-integration/includes/squat-radar-formatter.php

...ar-calendar-integration/includes/squat-radar-instance.php

...adar-calendar-integration/includes/squat-radar-widget.php

...ntent/plugins/squat-radar-calendar-integration/readme.txt

.../plugins/squat-radar-calendar-integration/squat-radar.php