feat: add limitation in readme

Author: edmBernard

Readme.md

@@ -13,7 +13,7 @@ The code in this repository create a simple binding, function in c++ are impleme
 └── ...
 ```
 
-There is 3 way to build the project, more information can be found on pybin11 website [here](https://pybind11.readthedocs.io/en/stable/compiling.html#build-systems) :
+There is 3 way to build the project, more information can be found on pybind11 website [here](https://pybind11.readthedocs.io/en/stable/compiling.html#build-systems) :
   1. build with cmake : the basic, compiled library will be generated in build folder
   2. build with setup.py and cmake : install your module in python and dependency are managed by cmake/vcpkg (opencv and pybind11)
   3. build with setup.py and setuptools : install your module in python and dependency are managed by python package (opencv and pybind11) *** Soon ***
@@ -94,3 +94,8 @@ Tests use the binding module generate by cmake.
 ```bash
 python -m pytest
 ```
+
+
+## Limitation
+
+Currently, the conversion between cv::Mat and Numpy.ndarray is done by copy.