Add my keymap.

keyboards/planck/keymaps/sgoodwin/readme.md

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+# sgoodwin's Planck Layout
+
+Includes:
+
+1. No Dvorak or Plover
+2. No alt-swapping
+3. Right enter is shift when held down, enter when tapped.
+4. Bottom left corner in normal layers is Hyper and not brightness control.
+5. Brightness is instead in the bottom corner on raise/lower.
+