Add isolike iris layout (#5157)

Keeps it simple and most keys in a similar position (at least relative
to other keys) to a standard ISO layout.

keyboards/keebio/iris/keymaps/isolike/readme.md

@@ -0,0 +1,5 @@
+# isolike keymap
+
+Modelled on the ISO keyboard layout. Key positions should feel quite familiar to
+ISO layout users. There is only two layers. The space, enter and raise keys are
+mirrored on both hands to make it easier to remember and type on.