Initial commit

Add .gitignore to exclude VSCode workspace files and build artifacts

handler.hpp

@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+#include <exception>
+
+#include <stdexcept>
+
+class InvalidInput : public std::runtime_error
+{
+public:
+    InvalidInput(const std::string& what = "") : std::runtime_error(what) {}
+};
+
+
+std::string process(const std::string &username);