Add initial Microsoft Teams support

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

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

@@ -0,0 +1,25 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+// ContentFormat undocumented
+type ContentFormat int
+
+const (
+	// ContentFormatVDefault undocumented
+	ContentFormatVDefault ContentFormat = 0
+	// ContentFormatVEmail undocumented
+	ContentFormatVEmail ContentFormat = 1
+)
+
+// ContentFormatPDefault returns a pointer to ContentFormatVDefault
+func ContentFormatPDefault() *ContentFormat {
+	v := ContentFormatVDefault
+	return &v
+}
+
+// ContentFormatPEmail returns a pointer to ContentFormatVEmail
+func ContentFormatPEmail() *ContentFormat {
+	v := ContentFormatVEmail
+	return &v
+}