Sorry, it’s q. then press enter
You are currently trapped in vim, https://www.linux.com/training-tutorials/vim-101-beginners-guide-vim/
I tried this but its not working in my case 
Try ctrl + X, I don’t know why it would be nano instead of vim though (I assume you’re using git bash?)
When q doesn’t work, you usually need q!. This is “quit without saving”.
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