Add initial Microsoft Teams support

Documentation on https://github.com/42wim/matterbridge/wiki/MS-Teams-setup

vendor/github.com/yaegashi/msgraph.go/beta/RubricLevelModel.go

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// RubricLevel undocumented
+type RubricLevel struct {
+	// Object is the base model of RubricLevel
+	Object
+	// LevelID undocumented
+	LevelID *string `json:"levelId,omitempty"`
+	// DisplayName undocumented
+	DisplayName *string `json:"displayName,omitempty"`
+	// Description undocumented
+	Description *EducationItemBody `json:"description,omitempty"`
+	// Grading undocumented
+	Grading *EducationAssignmentGradeType `json:"grading,omitempty"`
+}