Add initial Microsoft Teams support

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

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

@@ -0,0 +1,17 @@
+// Code generated by msgraph-generate.go DO NOT EDIT.
+
+package msgraph
+
+import "time"
+
+// PlannerAssignment undocumented
+type PlannerAssignment struct {
+	// Object is the base model of PlannerAssignment
+	Object
+	// AssignedBy undocumented
+	AssignedBy *IdentitySet `json:"assignedBy,omitempty"`
+	// AssignedDateTime undocumented
+	AssignedDateTime *time.Time `json:"assignedDateTime,omitempty"`
+	// OrderHint undocumented
+	OrderHint *string `json:"orderHint,omitempty"`
+}