Created FAQ Keymap (markdown)

FAQ-Keymap.md

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+# Keymap
+## Power key doesn't work
+Use `KC_PWR` instead of `KC_POWER` or vice versa.
+- `KC_PWR` works with Windows and Linux, not with OSX.
+- `KC_POWER` works with OSX and Linux, not with Windows.
+
+http://geekhack.org/index.php?topic=14290.msg1327264#msg1327264
+
+## Oneshot modifier
+Solves my personal 'the' problem. I often got 'the' or 'THe' wrongly instead of 'The'.  Oneshot Shift mitgates this for me.
+https://github.com/tmk/tmk_keyboard/issues/67
+
+## Modifier/Layer stuck
+Modifier keys or layers can be stuck unless layer switching is configured properly.
+For Modifier keys and layer actions you have to place `KC_TRANS` on same position of destination layer to  unregister the modifier key or return to previous layer on release event.
+
+https://github.com/tmk/tmk_keyboard/blob/master/doc/keymap.md#31-momentary-switching
+http://geekhack.org/index.php?topic=57008.msg1492604#msg1492604
+
+
+## Mechanical Lock Switch Support
+https://github.com/tmk/tmk_keyboard#mechanical-locking-support
+
+This feature is for *mechanical lock switch* like this Alps one.
+http://deskthority.net/wiki/Alps_SKCL_Lock
+
+Using enabling this feature and using keycodes `LCAP`, `LNUM` or `LSCR` in keymap you can use physical locking CapsLock, NumLock or ScrollLock keys as you expected.
+
+Old vintage mechanical keyboards occasionally have lock switches but modern ones don't have. ***You don't need this feature in most case and just use keycodes `CAPS`, `NLCK` and `SLCK`.***