adding third party libs and defining some early API headers

include/regolith_lua.h

@@ -0,0 +1,21 @@
+#ifndef REGOLITH_LUA_H
+#define REGOLITH_LUA_H
+
+#include "regolith.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct lua_State;
+
+RG_API int rg_lua_open(rg_context* ctx);
+RG_API int rg_lua_dostring(rg_context* ctx, const char* code, const char* chunk_name);
+RG_API struct lua_State* rg_lua_state(rg_context *ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+