Add feedback for member creation

geneit_app/src/api/MemberApi.ts

@@ -98,6 +98,14 @@ export class Member implements MemberApi {
       family_id: family_id,
     });
   }
+
+  get fullName(): string {
+    const firstName = this.first_name ?? "";
+
+    return firstName.length === 0
+      ? this.last_name ?? ""
+      : `${firstName} ${this.last_name ?? ""}`;
+  }
 }
 
 export class MemberApi {