tp-multi-connect/README: Add notes from #48

tp-multi-connect/README.md

@@ -4,6 +4,15 @@ Thinkpad Multi-Connect Keyboard
 There is also another physically-identical keyboard, the Thinkpad
 *Multi-Connect* Keyboard, which allows you to toggle between 3 paired devices.
 
+
+* **HID Name:** ThinkPad Multi Connect Bluetooth Keyboard with Trackpoint
+* **Model:** KT-1525
+* **P/N:** 4X30K12182
+* **Fru P/N:** 03X7111
+* **Vendor ID:** 0x17ef
+* **Product ID:** 0x6083
+* **MFG:** CEM 2019-04-02
+
 It appears to be China-only, and only available through sites like AliExpress.
 There are no drivers for any OS (iOS/Android or Windows), just a single-sheet
 manual is available here:
@@ -12,3 +21,10 @@ http://webdoc.lenovo.com.cn/lenovowsi/new_cskb/att/147372/%E5%BF%AB%E9%80%9F%E4%
 Unlike the Compact keyboards, the keyboard does not have (known) built-in
 Fn-Lock functions, Fn, Fn-F1 and F1 are all separate scancodes, so they can be
 remapped using a ``hwdb`` database.
+
+Keyboard-supported key combinations:
+
+* **Fn+Up/Down:** Trackpoint sensitivity
+* **Fn+Delete:** Change paired device type (Windows/Android/iOS). Changes behaviour of some keys, e.g. Super.
+
+There is no known way of performing Fn-Lock (even under windows), or changing middle-button behaviour. See: https://github.com/lentinj/tp-compact-keyboard/issues/48