Document how to use a non-default keyboard layout (with AZERTY example)

[Calinou]

I can confirm running this solves the issue with the keyboard layout being stuck on QWERTY 🙂

Since AZERTY is one of the most common alternative keyboard layouts out there, I've listed it as an example.

This closes #99.

[droidben]

Maybe also include a link to where users can find their respective Code which is to be added to RDP_FLAGS. For me this link was helpful: https://github.com/awakecoding/FreeRDP-Manuals/blob/master/User/FreeRDP-User-Manual.markdown#input

[Frankkkkk]

This doesn't seem to work for me. I'm trying to use the dvorak layout with:

RDP_FLAGS="/kbd:layout:0x00010409 /cert:tofu /sound /microphone"                                                                                                                                                

However, it's still qwerty that is being used 🤔