Add initial Microsoft Teams support

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

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

@@ -0,0 +1,21 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ReferenceAttachment undocumented
+type ReferenceAttachment struct {
+	// Attachment is the base model of ReferenceAttachment
+	Attachment
+	// SourceURL undocumented
+	SourceURL *string `json:"sourceUrl,omitempty"`
+	// ProviderType undocumented
+	ProviderType *ReferenceAttachmentProvider `json:"providerType,omitempty"`
+	// ThumbnailURL undocumented
+	ThumbnailURL *string `json:"thumbnailUrl,omitempty"`
+	// PreviewURL undocumented
+	PreviewURL *string `json:"previewUrl,omitempty"`
+	// Permission undocumented
+	Permission *ReferenceAttachmentPermission `json:"permission,omitempty"`
+	// IsFolder undocumented
+	IsFolder *bool `json:"isFolder,omitempty"`
+}