[Keymap] Add model01 and doio/kb16 keymaps (#18681)

keyboards/keyboardio/model01/keymaps/pugmajere/readme.md

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+# pugmajere's fairly modified version of the default keymap
+
+This is fairly modified, but roughly follows the original default
+keymap in spirit.
+
+- The num lock layer is removed.
+- The "any" key is replace with RALT.
+- The thumb keys are converted into combo keys.
+- Page-Up is a combo key with LCTRL.
+- The NUMLOCK key is replaced with LCTRL-PGUP (for bouncing through
+  browser tabs)
+- Mouse scroll keys are added.
+- Some KVM control sequences are worked into a few open slots in the
+  keymap. (FN-[tgb])
+- QMK-standard debouncing is enabled.
+- A bunch of RGB Matrix modes are turned off to save space.
+
+Quite possibly something else that I'm forgetting about.
+
+