feat: Add documentation for Goodix fingerprint

reader and Touchpad preference in Gnome Settings

[dell/xps/15-9530/README.wiki]
- Added documentation for Goodix fingerprint reader
- Noted that the fingerprint reader has only been
tested on Gnome
- Mentioned that a reboot is required for
fingerprint options to appear in Gnome Settings
- Registered fingerprints in the Users module in
Gnome Settings
- Set the password as the login method to unlock
the keyring
- Enabled the preference to disable the Touchpad
while typing
- Recommended disabling the Touchpad during typing
showing an example using Home-Manager and `dconf`

dell/xps/15-9530/README.wiki

@@ -8,6 +8,7 @@
 * Screen: 15" 4k (3456 x 2160)
 * Graphics: NVIDIA GeForce RTX 4070 Laptop GPU, with Intel Graphics too.
 * Input: Touchscreen and trackpad.
+* Fingerprint Reader: Goodix
 
 == Notes ==
 
@@ -18,3 +19,23 @@ In order to run a program on the NVIDIA gpu, you can use the `nvidia-offload` fu
 nvidia-offload `nix-shell -p glxinfo --run 'glxgears'`
 ```
 This is a short bash script that sets the proper environment variables and calls your command.
+
+== Fingerprint Reader ==
+
+I have added support for the fingerprint reader. It has however been tested on Gnome  only.
+
+- After Installation, I had to reboot once before the fingerprint options  would showin the Users module in Gnome Settings
+- You will need to register your fingerprints in the Users module in Gnome Settings
+- When logging in I suggest using your password otherwise the keyring is not unlocked at login. You can use the fingerprint reader at all other times.
+
+== Touchpad ==
+
+This is a matter of preference, but I do recommend disabling the Touchpad while typing. I hit it with my palm all the time.
+
+Since I am using Gnome, I have done this through Home-Manager using `dconf`.
+
+```
+"org/gnome/desktop/peripherals/touchpad" = {
+      disable-while-typing = true;
+    };
+```