Convert backend to regular directory

backend/src/validations/admin.validation.js

@@ -0,0 +1,14 @@
+const { z } = require("zod");
+
+const createEmployeeSchema = z.object({
+  firstname: z.string().min(2),
+  lastname: z.string().min(2),
+  email: z.string().email(),
+  password: z.string().min(8),
+  birthdate: z.string().optional(),
+  gender: z.string().optional(),
+});
+
+module.exports = {
+  createEmployeeSchema,
+};