Restructure codebase to use src directory

src/validation/APIResponseValidationSchema.ts

@@ -0,0 +1,10 @@
+import { z } from 'zod';
+
+const APIResponseValidationSchema = z.object({
+  message: z.string(),
+  statusCode: z.number(),
+  success: z.boolean(),
+  payload: z.unknown(),
+});
+
+export default APIResponseValidationSchema;