Split apps controllers into separate files

controllers/apps/getSingleApp.js

@@ -0,0 +1,27 @@
+const asyncWrapper = require('../../middleware/asyncWrapper');
+const App = require('../../models/App');
+
+// @desc      Get single app
+// @route     GET /api/apps/:id
+// @access    Public
+const getSingleApp = asyncWrapper(async (req, res, next) => {
+  const app = await App.findOne({
+    where: { id: req.params.id },
+  });
+
+  if (!app) {
+    return next(
+      new ErrorResponse(
+        `App with the id of ${req.params.id} was not found`,
+        404
+      )
+    );
+  }
+
+  res.status(200).json({
+    success: true,
+    data: app,
+  });
+});
+
+module.exports = getSingleApp;