feat(controllers): add category creation functionality

A new controller, category.controller.ts, has been added to handle category creation.
This includes validation to prevent the creation of duplicate categories and error handling in the event of failure to create a new category.

Issue: #12
Signed-off-by: Mathis <yidhra@tuta.io>

src/controllers/category.controller.ts

@@ -0,0 +1,41 @@
+import type {Request, Response} from "express";
+import {Logger} from "tslog";
+import type IDbCategory from "@interfaces/database/IDbCategory";
+import CategoryService from "@services/category.service";
+//import {validationResult} from "express-validator";
+
+
+const logger = new Logger({ name: "CategoryController" });
+
+
+/**
+ * Creates a new category.
+ *
+ * @param {Request} req - The request object containing the category information.
+ * @param {Response} res - The response object to send back to the client.
+ * @returns {Promise<Response>} The response object indicating the outcome of the category creation.
+ */
+async function createCategory(req: Request, res: Response): Promise<Response> {
+	const body: IDbCategory = req.body
+	const doesExist = await CategoryService.getBySlug(`${body.slug_name}`)
+	if (doesExist) {
+    logger.error("Category already exists");
+    return res.status(400).json({ error: "Category already exists" });
+  }
+	const createResult = await CategoryService.create({
+		display_name: `${body.display_name}`,
+		slug_name: `${body.slug_name}`
+	})
+	if (!createResult) {
+		logger.error("Failed to create category");
+    return res.status(500).json({ error: "Failed to create category" });
+	}
+	return res.status(201).json({ message: "Category created successfully" });
+
+}
+
+const CategoryController = {
+	create: createCategory
+}
+
+export default CategoryController;