Add keymaps for ergodox ez, hhkb and jd45 under user blakedietz

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+# QMK HHKB Keymap: blakedietz
+
+<!-- TODO: Link to Hasu's geekhack page from his name -->
+<!-- TODO: Link to the ergodox ez layout in this repository -->
+
+This is my (Blake Dietz's) own take on a QMK keymap for the Happy Hacking Keyboard Pro 2 alternate controller made by Hasu. A lot of the
+ functionality was inspired by the ergodox ez default layout. 
+
+## Dependencies
+
+### macOS
+
+```bash
+brew tap osx-cross/avr
+brew install avr-libc
+brew install dfu-programmer
+```
+
+### Windows/Linux
+
+[Build Environment Setup](https://github.com/jackhumbert/qmk_firmware/wiki#build-environment-setup)
+
+## Flashing
+
+You will need to make sure that you have something that you can use to press the button on the alternate controller in
+order to put it into boot mode.
+
+From the hhkb directory run the following:
+
+```bash
+make clean
+make hhkb-blakedietz-dfu
+```
+
+Press the button on the alternate controller to put the board into boot mode.
+
+You'll see an output similar to the following:
+
+```bash
+make hhkb-blakedietz-dfu
+
+Making hhkb with keymap blakedietz and target dfu
+
+avr-gcc (GCC) 6.2.0
+Copyright (C) 2016 Free Software Foundation, Inc.
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+Size before:
+   text    data     bss     dec     hex filename
+      0   22162       0   22162    5692 hhkb_blakedietz.hex
+
+Compiling: keyboards/hhkb/keymaps/blakedietz/keymap.c                                               [OK]
+Compiling: ./tmk_core/common/command.c                                                              [OK]
+Linking: .build/hhkb_blakedietz.elf                                                                 [OK]
+Creating load file for Flash: .build/hhkb_blakedietz.hex                                            [OK]
+
+Size after:
+   text    data     bss     dec     hex filename
+      0   22162       0   22162    5692 hhkb_blakedietz.hex
+
+dfu-programmer: no device present.
+Error: Bootloader not found. Trying again in 5s.
+dfu-programmer: no device present.
+Error: Bootloader not found. Trying again in 5s.
+Bootloader Version: 0x00 (0)
+Erasing flash...  Success
+Checking memory from 0x0 to 0x6FFF...  Empty.
+Checking memory from 0x0 to 0x56FF...  Empty.
+0%                            100%  Programming 0x5700 bytes...
+[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
+0%                            100%  Reading 0x7000 bytes...
+[>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>]  Success
+Validating...  Success
+0x5700 bytes written into 0x7000 bytes memory (77.68%).
+```
+
+### Layers 
+
+#### Default
+
+##### A more "standard" layout
+
+This layout places tilde in the standard location. Backspace is moved to the two upper-right-most keys and pipe
+is put back where it belongs (where backspace is on the default hhkb2 keymapping).
+
+##### Hyper key
+
+<!-- TODO: Link to Brett's article about the thyper key -->
+
+This layout throws out the HHKB's control key in favor of a Hyper key. Ctrl is instead placed on the z and / keys and
+can be activated with a long press. I find that this is far more ergonomic as it's less of a reach and it allows you to
+alternate to either hand when you need to use `ctrl` as a modifier.
+
+The hyper key can be held for hyper and tapped for escape. You'll find that this is quite nice for vim.
+
+Enter is also a hyper key. This allows for symmetry between control and enter. Hold for hyper, tap for enter.
+
+##### Tap to Hold
+
+###### CTL, ALT, GUI
+
+Since the HHKB does not have three super/meta keys, these keys were moved to pinky, ring and middle finger for ctrl, alt/
+ option and super respectively. This is closer to home row which I've found causes less strain.
+ 
+The Alt and Super keys are instead replaced with layer toggle keys to go to dev and mouse mode respectively.
+
+###### Space
+
+Hold space to switch to dev mode. This will put you on a layer to have vim like arrow functionality on h,j,k and l. Use
+this in editors that don't have vim keybindings.
+
+### Dev 
+
+The Dev layer can be activated holding space or hitting the HHKB's Alt key. This will put you in a mode
+where all function keys are available and left, right, up and down are mapped to their vim equivalents. The function
+ keys are mapped in such a way that you can use them for debugging. Typically I map debugging functions in all IDEs to
+ the following for a seamless debugging experience (e.g. jumping from Intellij to chrome dev tools and back):
+ 
+ - f1 -> step over
+ - f2 -> step into
+ - f3 -> step out
+ - f4 -> continue
+ - f5 -> set break point on current line
+
+### Media
+
+The media layer can be activated by pressing and holding the semi-colon. I've also placed the play and pause key on the
+apostrophe key in the media layer. This allows you to easily roll your pinky from the media toggle (semi-colon) to the
+play/pause key in one fluid motion.
+
+I've also tried to logically map next/previous track along with volume up/down vim behavior. In vim since middle finger
+goes up on k and index finger goes down on j, next/prev track is k/j respectively. ,/m changes volume up/down
+respectively while toggled to the media layer.