Add Teclast X89 Kindow firmware

firmware/teclast/x89_kindow/README.md

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+Teclast/X89 Kindow
+---------------------------------------------
+
+| Item                      | Description |
+|---------------------------|-------------|
+| Manufacturer              | Teclast |
+| Device                    | X89 Kindow |
+| Website                   | https://www.teclast.com/zt/x89kindow/ |
+| Vendor driver (Windows)   | https://1drv.ms/u/s!AmcmANHiV08fnzzVk9wG48BeiE7W?e=YbnK8u (extracted from Windows Install.wim) |
+| Extracted firmware        | [firmware.fw](firmware.fw) |
+| Firmware for gslx680-acpi | [silead_ts.fw](silead_ts.fw) |
+| Display resolution        | 1440x1080 |
+| Touch panel resolution    | 1660x860 (by trial and error) |
+| Touch controller          | GSL1680 |
+| Multitouch support        | Yes (10) |
+| Finger tracking           | Yes |
+| Mirrored horizontally     | Yes |
+| Mirrored vertically       | No |
+| Axes swapped              | Yes |
+| Comments                  | tools/fwtool -c firmware.fw -m 1680 -w 860 -h 1660 -f track,swap,xflip -t 10 silead_ts.fw |