It`s auto build AGWA/git-crypt for Windows.
The easiest way to get started with the git-crypt is to download the latest release and copy it in to yours Git folder.
For example, for me full way to git-crypt file looks like this:
C:\Program Files\Git\cmd\git-crypt.exe
After that, for start work you can open yours git-bash or cmd console and try to write:
git-crypt
If you accidentally got here, but want to use git-crypt on Linux, please, go to LINUX_README.md.
Thats all.