Add basic organization structs

organization.go

@@ -0,0 +1,27 @@
+package writeas
+
+// Role is an OrgMember's role.
+type Role string
+
+const (
+	RoleAdmin  Role = "admin"
+	RoleEditor Role = "editor"
+	RoleAuthor Role = "author"
+)
+
+type (
+	// OrgMember represents a member of an Organization
+	OrgMember struct {
+		Author
+		Email string `json:"email"`
+		Role  Role   `json:"role"`
+	}
+
+	// OrgMemberParams are parameters for creating or updating an OrgMember.
+	OrgMemberParams struct {
+		AuthorParams
+		Username string `json:"username"`
+		Email    string `json:"email"`
+		Role     Role   `json:"role"`
+	}
+)