[Keymap] Add personal lily58 keymap (#14834)

Co-authored-by: Ryan <fauxpark@gmail.com>
Co-authored-by: polplop <paultan@handshakes.com.sg>
Co-authored-by: paultan <47445257+polplop@users.noreply.github.com>

keyboards/lily58/keymaps/pttbx/rules.mk

@@ -0,0 +1,5 @@
+# If you want to change the display of OLED, you need to change here
+SRC += ./lib/rgb_state_reader.c \
+       ./lib/layer_state_reader.c \
+       ./lib/logo_reader.c \
+       ./lib/keylogger.c