Added vote route in backend

backend/src/validations/voteValidation.js

@@ -0,0 +1,14 @@
+import { z } from "zod";
+
+const voteSchema = z.object({
+  pollId: z.string({
+    required_error: "Poll Id is required.",
+    invalid_type_error: "Poll Id should be a string.",
+  }),
+  optionId: z.string({
+    required_error: "Option Id is required.",
+    invalid_type_error: "Option Id should be a string.",
+  }),
+});
+
+export default voteSchema;