Added readme.package.md

README.PACKAGE.md

+# Generate or update the package
+- I used this tuto: https://packaging.python.org/en/latest/tutorials/packaging-projects/
+- Dependencies are in pyprojetc.toml, and some infos in setup.cfg
+- With the `python3 -m build` command, packe is built and put in the `dist` floder
+- Then we can upload it on pypi or test.pypi with my ids pypi or test.pypi (diffenrent !)
+- Then install test or real version
+- Other files than pyhon files are not included by default. To add json files for examples, add this in setup.cfg:
+```
+include_package_data = True
+[options.packages_data]
+* = *.json
+```