add general graph class description

aidge_export_tensorrt/static/tensorrt_8.6/include/Graph.hpp

@@ -32,6 +32,15 @@ typedef struct
     unsigned int nIO;
 } IOGraphDesc;
 
+/**
+ * @class Graph
+ * @brief Manages the lifecycle and execution of a neural network graph using TensorRT.
+ *
+ * The Graph class encapsulates the functionality required to manage, configure, and execute
+ * a neural network graph for inference using NVIDIA's TensorRT. This includes loading models
+ * from ONNX or TensorRT files, setting the CUDA device and data types, managing calibration
+ * for INT8 precision, and running inference in both synchronous and asynchronous modes.
+ */
 class Graph
 {
 public: