feat(render): add model loading and rendering pipeline

src/render/model_manager.cpp

@@ -0,0 +1,32 @@
+#include "Cubed/render/model_manager.hpp"
+
+#include "Cubed/tools/log.hpp"
+namespace Cubed {
+
+ModelManager::ModelManager() {}
+
+ModelManager::~ModelManager() {}
+
+void ModelManager::init() {
+
+};
+
+const ModelNode& ModelManager::get_model(const std::string& model_name) {
+    auto it = m_models.find(model_name);
+    if (it == m_models.end()) {
+        return load_model(model_name);
+    }
+    return it->second;
+}
+
+const ModelNode& ModelManager::load_model(const std::string& model_name) {
+    std::string path = ASSETS_PATH + model_name;
+    auto model = m_loader.load(path);
+    auto [it, instert] = m_models.try_emplace(model_name, std::move(model));
+    if (!instert) {
+        Logger::error("Model Key {} already exist!", model_name);
+    }
+    return it->second;
+}
+
+} // namespace Cubed