Upgrade setup.py to add version.txt in python package

setup.py

 #!/usr/bin/env python3
-""" Aidge Export CPP
+""" Aidge CPP generic export
 """
 
 DOCLINES = (__doc__ or '').split("\n")
@@ -13,24 +13,66 @@ if sys.version_info[:2] < (3, 7):
 
 CLASSIFIERS = """\
 Development Status :: 2 - Pre-Alpha
+Intended Audience :: Developers
+Intended Audience :: Education
+Intended Audience :: Science/Research
+License :: OSI Approved :: Eclipse Public License 2.0 (EPL-2.0)
+Programming Language :: C++
+Programming Language :: Python
+Programming Language :: Python :: 3
+Programming Language :: Python :: 3.7
+Programming Language :: Python :: 3.8
+Programming Language :: Python :: 3.9
+Programming Language :: Python :: 3 :: Only
+Topic :: Scientific/Engineering
+Topic :: Scientific/Engineering :: Artificial Intelligence
+Topic :: Software Development
 """
 
+import os
+import shutil
 import pathlib
 
-from setuptools import setup
+from setuptools import setup, Extension
 from setuptools import find_packages
+from setuptools.command.build_ext import build_ext
 
 def get_project_version() -> str:
     aidge_root = pathlib.Path().absolute()
     version = open(aidge_root / "version.txt", "r").read().strip()
     return version
 
+class AdditionalExtension(Extension):
+    def __init__(self, name):
+        super().__init__(name, sources=[])
+
+class AdditionalBuild(build_ext):
+
+    def run(self):
+        cwd = pathlib.Path().absolute()
+
+        build_temp = cwd / "build"
+        if not build_temp.exists():
+            build_temp.mkdir(parents=True, exist_ok=True)
+
+        build_lib = pathlib.Path(self.build_lib)
+        if not build_lib.exists():
+            build_lib.mkdir(parents=True, exist_ok=True)
+
+        aidge_package = build_lib / "aidge_export_cpp"
+
+
+        # Copy version.txt in aidge_package
+        os.chdir(os.path.dirname(__file__))
+        shutil.copy("version.txt", str(aidge_package.absolute()))
+
 
 if __name__ == '__main__':
 
     setup(
         name="aidge_export_cpp",
         version=get_project_version(),
+        license="Eclipse Public License 2.0 (EPL-2.0)",
         python_requires='>=3.7',
         description=DOCLINES[0],
         long_description_content_type="text/markdown",
@@ -39,4 +81,8 @@ if __name__ == '__main__':
         platforms=["Linux"],
         packages=find_packages(where="."),
         include_package_data=True,
+        ext_modules=[AdditionalExtension("aidge_export_cpp")],
+        cmdclass={
+            'build_ext': AdditionalBuild,
+        },
     )