add info endpoint

shared/src/dto/api/api.dto.ts

@@ -0,0 +1,44 @@
+import {
+  IsBoolean,
+  IsDefined,
+  IsInt,
+  IsNotEmpty,
+  IsString,
+  Max,
+  Min,
+  ValidateNested,
+} from 'class-validator';
+
+class BaseApiResponse<T extends Object, W extends boolean> {
+  @IsBoolean()
+  @IsDefined()
+  success: W;
+
+  @IsInt()
+  @Min(0)
+  @Max(1000)
+  @IsDefined()
+  statusCode: number;
+
+  @IsString()
+  @IsNotEmpty()
+  timestamp: string;
+
+  @ValidateNested()
+  @IsDefined()
+  data: T;
+}
+
+export class ApiSuccessResponse<T extends Object> extends BaseApiResponse<
+  T,
+  true
+> {}
+
+export class ApiErrorData {
+  @IsString()
+  @IsNotEmpty()
+  message: string;
+}
+export class ApiErrorResponse extends BaseApiResponse<ApiErrorData, false> {}
+
+export type ApiResponse<T> = ApiSuccessResponse<T> | ApiErrorResponse;