Add initial Microsoft Teams support

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

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

@@ -0,0 +1,21 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "encoding/json"
+
+// VisualInfo undocumented
+type VisualInfo struct {
+	// Object is the base model of VisualInfo
+	Object
+	// Attribution undocumented
+	Attribution *ImageInfo `json:"attribution,omitempty"`
+	// BackgroundColor undocumented
+	BackgroundColor *string `json:"backgroundColor,omitempty"`
+	// Description undocumented
+	Description *string `json:"description,omitempty"`
+	// DisplayText undocumented
+	DisplayText *string `json:"displayText,omitempty"`
+	// Content undocumented
+	Content json.RawMessage `json:"content,omitempty"`
+}