add instructions for Murex shell bindings

[lmorg]

There was a support request raised on the Murex shell's project page about integrating jump support. So the following module was created: https://github.com/lmorg/murex-module-jump

This can be installed automatically via Murex's package manager:

murex-package install https://github.com/lmorg/murex-module-jump.git

[gsamokovarov]

I see that https://github.com/lmorg/murex-module-jump offers shell integration code, I'm open to inline in jump shell if murex can offer easier integration similar to bash's eval "$(jump shell)". Should be straightforward to implement, see https://github.com/gsamokovarov/jump/tree/main/shell for more details.