Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// OutlookUser undocumented
+type OutlookUser struct {
+	// Entity is the base model of OutlookUser
+	Entity
+	// MasterCategories undocumented
+	MasterCategories []OutlookCategory `json:"masterCategories,omitempty"`
+	// TaskGroups undocumented
+	TaskGroups []OutlookTaskGroup `json:"taskGroups,omitempty"`
+	// TaskFolders undocumented
+	TaskFolders []OutlookTaskFolder `json:"taskFolders,omitempty"`
+	// Tasks undocumented
+	Tasks []OutlookTask `json:"tasks,omitempty"`
+}