Create qemu_winx11.md

docs/qemu_winx11.md

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+## Upgrade buster-backports qemu version
+
+```
+pkgs=$(for i in qemu qemu-block-extra:arm64 qemu-guest-agent \
+qemu-system qemu-system-arm qemu-system-common qemu-system-data \
+qemu-system-gui qemu-system-mips qemu-system-misc qemu-system-ppc \
+qemu-system-sparc qemu-system-x86 qemu-utils; \
+do echo -n "$i=$(apt-cache madison qemu|head -n1|awk '{print $3}')  "; \
+done) ;\
+apt install $pkgs
+```