Add README for Dell XPS 13 9350

Author: carlzulauf

dell/xps/13-9350/README.md

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+# [Dell XPS 13 9350](https://www.dell.com/en-us/shop/dell-laptops/xps-13-laptop/spd/xps-13-9350-intel-laptop)
+
+The ones with Intel Core Ultra 256V/258V/288V ("Lunar Lake") SoCs.
+
+## Fingerprint Sensor
+
+On top of power button. To enable, use `fprintd-enroll`.
+
+## Updating Firmware
+
+This device is supported by [fwupd](https://fwupd.org/). To perform updates, simply use `fwupdmgr`.
+
+- [Latest Update](https://fwupd.org/lvfs/devices/com.dell.uefi1a99170e.firmware)