BETTERZON-38: Added error handler, preparation for DB accessing

Backend/src/common/http-exception.ts

@@ -0,0 +1,13 @@
+export default class HttpException extends Error {
+    statusCode: number;
+    message: string;
+    error: string | null;
+
+    constructor(statusCode: number, message: string, error?: string) {
+        super(message);
+
+        this.statusCode = statusCode;
+        this.message = message;
+        this.error = error || null;
+    }
+}