[Keymap] Add Endemoniada keymaps (#6875)

* Add dz60 keymap

* Add my TADA68 layout

* Fix descriptions and formatting

* Formatting fixes

* Add readme file

* Formatting

* move caps lock to correct key, add F-keys to both layers

* Add readme for dz60

* First draft of custom Let's Split layout

* Some more keys

* Finalized keymap

* Added a bunch of custom shortcuts to make layout easier to read

* Add PERMISSIVE_HOLD option to modtap behavior

* Add lock and sleep shortcuts, formatting

* Minor fixes and adjustments

* Add PERMISSIVE_HOLD option, add sleep/lock shortcuts, minor fixes

* Add sleep/lock shortcuts, minor fixes

* fixups

* Major simplification of lets_split layout into more standard raise/lower/special layers

* Remove layer songs, add to readme

* Formatting

* Switch a few keys around for reachability

* Add windows/mac specific layers

* simplify layers

* Update README

* Fix legends

* Invert numpad and put Del in upper right corner

* Disable arrow keys on Raise, add build instructions

* Move dz60 keymap to its own branch

* Remove redundant configuration

* Change volume and sleep keycodes to standard

* Removing empty rules.mk

* Changing layer defines to enum

* Adding comment to explain reason for swapping KC_TRNS and KC_NO fillers

1 files changed, 58 insertions, 0 deletions

diff --git a/keyboards/tada68/keymaps/mekberg/readme.md b/keyboards/tada68/keymaps/mekberg/readme.md
new file mode 100644
index 0000000000..be578e9572
--- /dev/null
+++ b/keyboards/tada68/keymaps/mekberg/readme.md
@@ -0,0 +1,58 @@
+# Mekberg's TADA68 layout
+
+More or less a standard Swedish ISO layout, with Mac-centric key positions. All keys not assigned on non-default layers are set to KC_NO
+as I don't want them to pass through when activating a layer.
+
+# Layers
+
+### Base Layer
+
+```
+,----------------------------------------------------------------------------------------------------------------------------------------------.
+|  Esc   |    1   |    2   |    3   |    4   |    5   |    6   |    7   |    8   |    9   |    0   |    +   |    ´   |   Backspace    |  Home  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|    Tab     |    Q   |    W   |    E   |    R   |    T   |    Y   |    U   |    I   |    O   |    P   |    Å   |    ¨   |            |  End   |
+|--------------------------------------------------------------------------------------------------------------------------|          |--------|
+|    LCtrl     |    A   |    S   |    D   |    F   |    G   |    H   |    J   |    K   |    L   |   Ö    |   Ä    |   '    |   Enter  |  PgUp  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|  LShift  |   <>   |    Z   |   X    |   C    |    V   |    B   |    N   |    M   |   ,    |   .    |   -    |   RShift     |   Up   |  PgDn  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|  LCtrl   |   LAlt   | Command  |                        Space                          |Command |  RAlt  |  Fn    |  Left  |  Down  | Right  |
+`----------------------------------------------------------------------------------------------------------------------------------------------'
+```
+
+### Fn Layer (layer 1)
+
+```
+,----------------------------------------------------------------------------------------------------------------------------------------------.
+|        |   F1   |   F2   |   F3   |   F4   |   F5   |   F6   |   F7   |   F8   |   F9   |  F10   |  F11   |  F12   |     Delete     |  Ins   |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|            |        |   Up   |        |        |        |        |        |        |        |        |        |        |            |  Mute  |
+|--------------------------------------------------------------------------------------------------------------------------|          |--------|
+|  Caps Lock   |  Left  |  Down  | Right  | BLight |        |        |        |        |        |        |        |        |          | VolUp  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|          |        |        |        |  Bl-   |BLtoggle | Bl+   |        |        |        |        |        |              |  Stop  | VolDn  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|          |          |          |                                                       |        |        |        |  Prev  |  Play  |  Fwd   |
+`----------------------------------------------------------------------------------------------------------------------------------------------'
+```
+
+Mainly used for media keys and F-keys, as well as a nav cluster on WASD. Also has backlight keys, that are rarely used.
+
+### Modtap Tab Layer (layer 2)
+
+```
+,----------------------------------------------------------------------------------------------------------------------------------------------.
+|   Esc  |   F1   |   F2   |   F3   |   F4   |   F5   |   F6   |   F7   |   F8   |   F9   |  F10   |  F11   |  F12   |     Delete     |        |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|            |        |   Up   |        |        |        |        |        |        |        |        |        |        |            |  Mute  |
+|--------------------------------------------------------------------------------------------------------------------------|          |--------|
+|              |  Left  |  Down  | Right  |        |        |  Left  |  Down  |   Up   | Right  |        |        |        |          | VolUp  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|          |        |        |        |        |        |        |        |        |        |        |        |              | Stop   | VolDn  |
+|----------------------------------------------------------------------------------------------------------------------------------------------|
+|          |          |          |                                                       |        |        |        |  Prev  |  Play  |  Fwd   |
+`----------------------------------------------------------------------------------------------------------------------------------------------'
+```
+
+Tab acts as Tab when tapped, and as Layer 2 when held. Used for HJKL nav keys and Delete.