installation instructions do not work out of the box

[gabor1]

Describe the bug
A clear and concise description of what the bug is.

typing command from installation instructions results in error

To Reproduce
Steps to reproduce the behavior:

1. type "git clone git@github.com:ACEsuit/mace.git"
2. See error

gabor@Gabors-MacBook-Pro Downloads % git clone git@github.com:ACEsuit/mace.git
Cloning into 'mace'...
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.

Please make sure you have the correct access rights
and the repository exists.
gabor@Gabors-MacBook-Pro Downloads % 

Expected behavior
A clear and concise description of what you expected to happen.

mace to be cloned by git

Desktop (please complete the following information):

• OS: Mac OS Ventura

[gabor1]

I suggest that you replace the ssh URI with an https URL

[ilyes319]

I will change. It is weird that it stopped working, one of my key must have expired.

[ilyes319]

Closed, see #129