Adds a readme and hex for my experimental layout

keyboard/ergodox_ez/keymaps/erez_experimental/readme.md

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+# Erez's experimental layout
+
+This is my personal layout which I use to test out ideas which may or may not make it onto the default layout we ship with. It's based off the default layout, with various tweaks.
+
+Changelog:
+
+## Jan 19, 2016:
+
+* Made J into dual-action key (Alt when held down), to make Alt-tab more ergonomic.
+* Made ' into dual-action key (Win/Cmd when held down).
+