Add MISE as install option

[trothwell]

Consider updating README to add instructions to use MISE.

# Could be this simple to install MISE + lazygit
curl https://mise.run | sh
mise install lazygit@latest
mise use -g lazygit

MISE (mise-en-place is french for putting in place)

• Project: https://github.com/jdx/mise

The tool includes lazygit in it's internal default registry. Not sure who requested the addition. Perhaps you?

Find other tools in the registry:

• https://mise.jdx.dev/registry.html