Add information to readme.md

[r9926640-cyber]

Sir termux x11 work in proot-distro using this way.

First run termux x11 command in termux shell session not proot-distro example.

export DISPLAY=:1
termux-x11 :1 &

Now run proot-distro example.

proot-distro login ubuntu --shared-tmp

Now run desktop manager example.

export DISPLAY=:1
dbus-launch --exit-with-session xfce4-session

Or

export DISPLAY=:1
startxfce4

Now termux x11 app work.

So sir please add this information to readme.md file proot section with better guide or example.
The example help termux users.