Update README.md to help Windows users

[robido]

#115 #41 #13

The extra comments in README.md will help Windows users get past the above issues, until this is fixed in Cookiecutter:
cookiecutter/cookiecutter#1159

[akashvibhute]

Hi Robido,
Maybe you can add the following command to convert all line endings

find . -type f -exec dos2unix {} \;

This would be easier than doing it with notepad++

source -
https://stackoverflow.com/questions/7068179/convert-line-endings-for-whole-directory-tree-git

[tiangolo]

Thanks for taking the effort to document this @robido ! 🤓 🍰

I finally found a way to solve it in the project itself with #149 🎉

Now, for new projects, it fixes the line endings of shell files after project generation.

Given that, I'll pass on this PR. But thanks for your effort!