Added arn to the main repository

arn/GroupMember.go

@@ -0,0 +1,20 @@
+package arn
+
+// GroupMember ...
+type GroupMember struct {
+	UserID UserID `json:"userId"`
+	Role   string `json:"role"`
+	Joined string `json:"joined"`
+
+	user *User
+}
+
+// User returns the user.
+func (member *GroupMember) User() *User {
+	if member.user != nil {
+		return member.user
+	}
+
+	member.user, _ = GetUser(member.UserID)
+	return member.user
+}