Add initial readme for AMD Xilinx Kria KR260

Signed-off-by: the-snowwhite <producer@holotronic.dk>

Author: the-snowwhite

HW/VivadoProjects/xilinx/kr260/README.md

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+## Running machinekit-hal on the Kria KR260 board
+
+First Iteration of the KR260 port runs on the  Xilinx Ubuntu Desktop 22.04 LTS from Canonical:
+https://ubuntu.com/download/amd-xilinx
+
+## Docker based build image for building custom bitfiles:
+
+    docker pull thesnowwhite/bionic-vivado-sdk:2022.2
+    sudo mkdir /tftpboot
+    /usr/bin/docker run --rm --privileged --memory 48g --shm-size 1g --device /dev/snd -itv $(pwd):/work -e DISPLAY=$DISPLAY -v /tmp/.X11-unix:/tmp/.X11-unix --net=host -e TZ=Europe/Copenhagen -v $HOME/.Xauthority:/home/vivado/.Xauthority -v $HOME/.Xresources:/home/vivado/.Xresources -v $HOME/.Xilinx:/home/vivado/.Xilinx -v /tftpboot:/tftpboot --name xilinx-sdk bionic-vivado-sdk:2022.2 /bin/bash
+
+## To enable running hostmot2 based machinekit-hal the mksocfpga fpga firmware can be auto loaded
+
+
+    wget
+
+    sudo mkdir -p /lib/firmware/xilinx/machinekit
+    sudo cp kr260_xck26.bit kria_kr260_xck26_ol.dtbo /lib/firmware/xilinx/machinekit
+
+    sudo sh -c 'cat <<EOF > "/lib/firmware/xilinx/machinekit/shell.json"
+    {
+        "shell_type" : "XRT_FLAT",
+        "num_slots": "1"
+    }
+    EOF'
+
+    sudo sh -c 'cat <<EOF > "/etc/dfx-mgrd/default_firmware"
+    machinekit
+    EOF'
+
+## Until the machinekit-hal cloudsmith Jammy packages get online the debs are provided here:
+
+    wget
+
+Then install the following packages:
+
+    sudo apt install ./machinekit-hal_0.5.21099-1.git2c2ff0e51~jammy_arm64.deb \
+    ./libmachinekit-hal_0.5.21099-1.git2c2ff0e51~jammy_arm64.deb \
+
+
+
+
+## Hal is then invoked with:
+
+    halrun -I
+
+    loadrt hostmot2
+    newinst hm2_soc_ol hm2-socfpga0 already_programmed=1 -- config="num_pwmgens=3 num_stepgens=6"
+
+    exit
+
+## To check what happened in the log:
+
+    cat /var/log/syslog | grep 'rtapi\|msgd'
+
+
+## The syslog can be cleared with:
+
+    sudo sh -c 'echo "" > /var/log/syslog'