Keymap: Spaceman Spiff layout for KBD75 (#3595)

![Keyboard Layout](https://i.imgur.com/tQLYDvu.png)

<!-- http://www.keyboard-layout-editor.com/#/gists/c1e8a15c68e4c52eed84653f21ae2d29 -->

Designed specifically to make switching back-n-forth with the Apple's MacBook Pro keyboard intuitive. Has a slight tendency toward readline/vim keybindings.

Caps locks becomes an `Esc` when pressed alone, or a `Ctrl` when pressed with another key.

Base Layer
----------

As simalar to the Apple keyboard as possible. Notiable exception is `Caps Lock`:
- `Esc` when pressed alone
- `Ctrl` when pressed with another key

Control+ Layer
--------------

Left `Ctrl` key switches to the "Control+ Layer". This layer mostly acts like a control key in most cases, with a few exceptions:

- `Ctl+` + `hjkl` are vim-style motion keys
- `Ctl+` + `p` and `Ctl+` + `n` are page up and down
- `Ctl+` + `Backspace` is forward delete

Fn Layer
--------

Audio Controls:
- `Fn` + `a` Volume Down
- `Fn` + `s` Volume Up
- `Fn` + `d` Mute

To flash this layout you need to press `Fn+Backspace`

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+# Spaceman Spiff Layout for KBD75
+
+![Keyboard Layout](https://i.imgur.com/tQLYDvu.png)
+
+<!-- http://www.keyboard-layout-editor.com/#/gists/c1e8a15c68e4c52eed84653f21ae2d29 -->
+
+Designed specifically to make switching back-n-forth with the Apple's MacBook Pro keyboard intuitive. Has a slight tendency toward readline/vim keybindings.
+
+Caps locks becomes an `Esc` when pressed alone, or a `Ctrl` when pressed with another key.
+
+# Base Layer
+
+As simalar to the Apple keyboard as possible. Notiable exception is `Caps Lock`:
+- `Esc` when pressed alone
+- `Ctrl` when pressed with another key
+
+# Control+ Layer
+
+Left Ctrl key switches to the "Control+ Layer". This layer mostly acts like a control key in most cases, with a few exceptions:
+
+- `Ctl+` + `hjkl` are vim-style motion keys
+- `Ctl+` + `p` and `Ctl+` + `n` are page up and down
+- `Ctl+` + `Backspace` is forward delete
+
+# Fn Layer
+
+Audio Controls:
+- `Fn` + `a` Volume Down
+- `Fn` + `s` Volume Up
+- `Fn` + `d` Mute
+
+To flash this layout you need to press `Fn+Backspace`
+
+
+