[Keyboard] Littlefoot lx dev (#16771)

Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/tominabox1/littlefoot_lx/readme.md

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+# Littlefoot LX
+
+![littlefoot_lx](https://i.imgur.com/0WhgT5yh.jpeg)
+
+The Littlefoot LX is a premium, integrated pcb version of the Littlefoot by The_Royal. 
+
+* Keyboard Maintainer: [tominabox1](https://github.com/tominabox1)
+* Hardware Supported: Littlefoot LX integrated ATMega32u4
+* Hardware Availability: https://tachfactory.bigcartel.com
+
+There are two versions of this PCB:
+    Rev1 is the PCB that shipped with the group buy run by RPMorrison on Tach Factory. These PCBs can be identified by the bodge wire on column 4.
+    Rev2 is the PCB available after this group buy.
+
+Make example for this keyboard (after setting up your build environment):
+
+    make tominabox1/littlefoot_lx:default
+
+Flashing example for this keyboard:
+
+    make tominabox1/littlefoot_lx:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available