Create project skeleton

engine/include/foo.h

@@ -0,0 +1,11 @@
+/*
+ * Copyright (c) Camden Dixie O'Brien
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+#ifndef FOO_H
+#define FOO_H
+
+int foo(void);
+
+#endif