move @takashiski 's keebs into /takashiski (#16089)

keyboards/takashiski/namecard2x4/keymaps/default/readme.md

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+# The default keymap for namecard2x4
+
+this is test keymap.
+
+| 1 | 2 | 3 | 4 |
+| 5 | 6 | 7 | 8 |
+
+if hold 4, change to Backlight settings Layer.
+if hold 8, change to Windows action Layer(Open my computer, Open calculater and others).