How-to-prepare-the-code-for-a-release.md

 Here is the checklist to run before releasing a new version for mbtrack2:
 
  1. Create a new local branch from the merge develop (with all the feature branch intended to be included in the new version).
- 2. Update .rst for the readthedocs documentation
+ 2. Update `conf.py` and .rst files for the readthedocs documentation
  3. Book a new zenodo DOI and update readme.md, CITATION.cff and **init**.py
  4. Update the pyproject.toml file with version number, new dependencies and so on.
  5. Update README.md