Extracted routes from controllers, wrote readme's

api/src/middleware/errors.ts

@@ -0,0 +1,21 @@
+import { ErrorRequestHandler } from 'express';
+import { pick } from 'lodash';
+
+import { CustomError } from 'errors';
+
+export const handleError: ErrorRequestHandler = (error, _req, res, _next) => {
+  console.error(error);
+
+  const isErrorSafeForClient = error instanceof CustomError;
+
+  const clientError = isErrorSafeForClient
+    ? pick(error, ['message', 'code', 'status', 'data'])
+    : {
+        message: 'Something went wrong, please contact our support.',
+        code: 'INTERNAL_ERROR',
+        status: 500,
+        data: {},
+      };
+
+  res.status(clientError.status).send({ error: clientError });
+};