feat(User): create User interface

src/entities/User/index.ts

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+export * from "./model";

src/entities/User/model/index.ts

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+export * from "./types/types";

src/entities/User/model/types/types.ts

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+export interface User {
+  /**
+   * User's unique identifier.
+   */
+  id: string;
+  /**
+   * User's email address.
+   */
+  email: string;
+}