Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// Shift undocumented
+type Shift struct {
+	// ChangeTrackedEntity is the base model of Shift
+	ChangeTrackedEntity
+	// SharedShift undocumented
+	SharedShift *ShiftItem `json:"sharedShift,omitempty"`
+	// DraftShift undocumented
+	DraftShift *ShiftItem `json:"draftShift,omitempty"`
+	// UserID undocumented
+	UserID *string `json:"userId,omitempty"`
+	// SchedulingGroupID undocumented
+	SchedulingGroupID *string `json:"schedulingGroupId,omitempty"`
+}