Add initial Microsoft Teams support

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

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

@@ -0,0 +1,21 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// PlannerExternalReference undocumented
+type PlannerExternalReference struct {
+	// Object is the base model of PlannerExternalReference
+	Object
+	// Alias undocumented
+	Alias *string `json:"alias,omitempty"`
+	// Type undocumented
+	Type *string `json:"type,omitempty"`
+	// PreviewPriority undocumented
+	PreviewPriority *string `json:"previewPriority,omitempty"`
+	// LastModifiedBy undocumented
+	LastModifiedBy *IdentitySet `json:"lastModifiedBy,omitempty"`
+	// LastModifiedDateTime undocumented
+	LastModifiedDateTime *time.Time `json:"lastModifiedDateTime,omitempty"`
+}