Add basic project hierarchy

src/runtime/main.cpp

@@ -0,0 +1,12 @@
+#include <cstdlib>
+#include <print>
+
+int main(int argc, char** argv) {
+	std::println("Hello, World!");
+
+	for (int i = 0; i < argc; i++) {
+		std::println("argv[{}] = {}", i, argv[i]);
+	}
+
+	return EXIT_SUCCESS;
+}