docs(en): add external resources

Author: xchopin

docs/en/resources.md

@@ -0,0 +1,13 @@
+# External Resources
+
+
+## Documentation
+- [IMS Caliper](https://www.imsglobal.org/activity/caliper)
+- [IMS OneRoster](https://www.imsglobal.org/activity/onerosterlis)
+- [xAPI](https://experienceapi.com/)
+
+## Community projects
+- [Examples for loading data into OpenLRW](https://github.com/Apereo-Learning-Analytics-Initiative/community-dataloaders)
+- [Web Dashboard made by Apereo](https://github.com/Apereo-Learning-Analytics-Initiative/OpenDashboard)
+- [Web Dashboard made by University of Lorraine](https://github.com/xchopin/OpenDashboard-Advanced)
+- [Web Dashboard made by University of Michigan](https://github.com/tl-its-umich-edu/my-learning-analytics)