Update README.md

README.md

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 # crux-ports-jornada7xx-arm
+
+CRUX-ARM ports overlay for HP Jornada 710/720/728
+
+> IMPORTANT NOTE:
+>
+> Native compilation to build these ports is discouraged given the limitations of this device.
+> Instead it is preferable to use cross-compilation for target arm-linux-gnu
+
+To use these ports, download the `jornada7xx-arm.httpup` file to `/etc/ports`:
+```
+$ sudo wget -P /etc/ports https://raw.githubusercontent.com/crux-arm/crux-ports-jornada7xx-arm/main/jornada7xx-arm.httpup
+$ sudo ports -u jornada7xx-arm
+```
+
+You may want to list it first in `/etc/prt-get.conf` to take advantage of ports overlay:
+```
+###
+### prt-get conf
+###
+
+# note: the order matters: the package found first is used
+prtdir /usr/ports/jornada7xx-arm
+prtdir /usr/ports/core-arm
+prtdir /usr/ports/opt-arm
+prtdir /usr/ports/xorg-arm
+prtdir /usr/ports/core
+prtdir /usr/ports/opt
+prtdir /usr/ports/xorg
+```