[Keymap] Added my customized 40% layout (#7555)

* Formatting of Contra readme.

* Initial version of my custom keymap

* Move TODOs to readme

* Add comment

* Nuke Plover layer

* Port changes to other layers

* Finished work on my own layout for now

* Add layout image

* Processed comments from review

1 files changed, 22 insertions, 0 deletions

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+# Alper's Contra Layout
+
+![Dvorak Layout](https://i.imgur.com/BvBYgpz.png)
+
+## Rationale
+
+I based this off the default and changed some stuff because I'm a macOS user who types in Dvorak:
+
+* Ctrl/Tab: It is normal to remap Caps Lock to control there and having a press button there for Tab would solve a lot of problems. BUT on my Contra this button is broken, so I've mapped 0,0 to Tab as well.
+* Shift/Esc: A standard left shift with an Escape that I have not been utilizing much in favor of the top corner button.
+* Tab: The replacement tab.
+* Overloaded the Left arrow with another GUI (Command) button because that is essential on macOS.
+* Overloaded the Enter button with a Shift because like Command, it is essential for me to have these on both sides of the keyboard.
+* Raise-0,0: Switches between windows of an application.
+* Raise-0,1-2: Dedicated next and previous tab buttons since these key combinations caused a finger twister.
+
+
+## TODO
+
+* Try out tapdance for brackets (see ryanm101/keymap.c)
+* REMAP ESC To LT() so I can use it to select numbers (_NUMB) and functions more easily? (see msiu/keymap.c) https://docs.qmk.fm/#/feature_advanced_keycodes?id=switching-and-toggling-layers
+* Wipe everything except Dvorak and Qwerty (see deastiny/keymap.c)
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