Add initial Microsoft Teams support

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

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

@@ -0,0 +1,27 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// Mention undocumented
+type Mention struct {
+	// Entity is the base model of Mention
+	Entity
+	// Mentioned undocumented
+	Mentioned *EmailAddress `json:"mentioned,omitempty"`
+	// MentionText undocumented
+	MentionText *string `json:"mentionText,omitempty"`
+	// ClientReference undocumented
+	ClientReference *string `json:"clientReference,omitempty"`
+	// CreatedBy undocumented
+	CreatedBy *EmailAddress `json:"createdBy,omitempty"`
+	// CreatedDateTime undocumented
+	CreatedDateTime *time.Time `json:"createdDateTime,omitempty"`
+	// ServerCreatedDateTime undocumented
+	ServerCreatedDateTime *time.Time `json:"serverCreatedDateTime,omitempty"`
+	// DeepLink undocumented
+	DeepLink *string `json:"deepLink,omitempty"`
+	// Application undocumented
+	Application *string `json:"application,omitempty"`
+}