Add initial Microsoft Teams support

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

vendor/github.com/yaegashi/msgraph.go/beta/Office365GroupsActivityCountsModel.go

@@ -0,0 +1,25 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// Office365GroupsActivityCounts undocumented
+type Office365GroupsActivityCounts struct {
+	// Entity is the base model of Office365GroupsActivityCounts
+	Entity
+	// ReportRefreshDate undocumented
+	ReportRefreshDate *time.Time `json:"reportRefreshDate,omitempty"`
+	// ExchangeEmailsReceived undocumented
+	ExchangeEmailsReceived *int `json:"exchangeEmailsReceived,omitempty"`
+	// YammerMessagesPosted undocumented
+	YammerMessagesPosted *int `json:"yammerMessagesPosted,omitempty"`
+	// YammerMessagesRead undocumented
+	YammerMessagesRead *int `json:"yammerMessagesRead,omitempty"`
+	// YammerMessagesLiked undocumented
+	YammerMessagesLiked *int `json:"yammerMessagesLiked,omitempty"`
+	// ReportDate undocumented
+	ReportDate *time.Time `json:"reportDate,omitempty"`
+	// ReportPeriod undocumented
+	ReportPeriod *string `json:"reportPeriod,omitempty"`
+}