Add initial Microsoft Teams support

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

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

@@ -0,0 +1,13 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// OfficeUserCheckinSummary undocumented
+type OfficeUserCheckinSummary struct {
+	// Object is the base model of OfficeUserCheckinSummary
+	Object
+	// SucceededUserCount undocumented
+	SucceededUserCount *int `json:"succeededUserCount,omitempty"`
+	// FailedUserCount undocumented
+	FailedUserCount *int `json:"failedUserCount,omitempty"`
+}