Add readme for layout

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+Hexwire's Let's Split Layout
+============================
+
+### Changes from default layout
+
+- Main layer
+    - The right space bar key has been changed to backspace, as I only hit space with my left thumb
+    - Backtick is at the lower right and also serves goes to the 3rd function layer when held
+    - Enter key acts as shift when held
+    - Escape key acts as control when held
+    - Minus key at upper right
+- Lower layer
+    - Numbers are on the lower layer, to make it easier to use a numpad on the right hand
+    - Arrow keys
+    - Straight and curly brackets in the middle two columns
+    - Screenshot keys for MacOS
+- Upper layer
+    - Symbols are on the upper layer
+    - Media keys
+    - Page Up/Down, Home/End
+- 3rd function layer
+    - Function keys
+
+## Layouts
+
+### Qwerty
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+ TAB , Q  , W  , E  , R  , T  ,      Y  , U  , I  , O  , P  ,MINS,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X0 , A  , S  , D  , F  , G  ,      H  , J  , K  , L  ,SCLN,QUOT,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+ LSFT, Z  , X  , C  , V  , B  ,      N  , M  ,COMM,DOT ,SLSH, X4 ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X3 ,LCTL,LALT,LGUI, X1 ,SPC ,     BSPC, X2 ,LEFT,DOWN, UP ,RGHT
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```
+
+### Colemak
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+ TAB , Q  , W  , F  , P  , G  ,      J  , L  , U  , Y  ,SCLN,MINS,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X0 , A  , R  , S  , T  , D  ,      H  , N  , E  , I  , O  ,QUOT,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+ LSFT, Z  , X  , C  , V  , B  ,      K  , M  ,COMM,DOT ,SLSH, X4 ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X3 ,LCTL,LALT,LGUI, X1 ,SPC ,     BSPC, X2 ,LEFT,DOWN, UP ,RGHT
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```
+
+### Dvorak
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+ TAB ,QUOT,COMM,DOT , P  , Y  ,      F  , G  , C  , R  , L  ,MINS,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X0 , A  , O  , E  , U  , I  ,      D  , H  , R  , N  , S  ,SLSH,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+ LSFT,SCLN, Q  , J  , K  , X  ,      B  , M  , W  , V  , Z  , X4 ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+  X3 ,LCTL,LALT,LGUI, X1 ,SPC ,     BSPC, X2 ,LEFT,DOWN, UP ,RGHT
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```
+
+### Lower
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+     , 1  , 2  , 3  , 4  , 5  ,      6  , 7  , 8  , 9  , 0  ,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+ DEL ,CAPP,LEFT,RGHT, UP ,LBRC,     RBRC, P4 , P5 , P6 ,PLUS,PIPE,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,CPYP,    ,    ,DOWN,LCBR,     RCBR, P1 , P2 , P3 ,MINS,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,    ,    ,    ,    ,    ,     DEL , P0 ,PDOT,    ,    ,   
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```
+
+### Raise
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+     ,EXLM, AT ,HASH,DLR ,PERC,     CIRC,AMPR,ASTR,LPRN,RPRN,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+ DEL ,MPRV,MNXT,VOLU,PGUP,UNDS,     EQL ,HOME,    ,    ,    ,BSLS,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,MSTP,MPLY,VOLD,PGDN,MINS,     PLUS,END ,    ,    ,    ,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,    ,    ,    ,MUTE,    ,         ,    ,    ,    ,    ,    
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```
+
+### 3rd function layer
+
+```
+,----+----+----+----+----+----.    ,----+----+----+----+----+----.
+ F12 , F1 , F2 , F3 , F4 , F5 ,      F6 , F7 , F8 , F9 ,F10 ,F11 ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,    ,    ,    ,    ,    ,         ,    ,    ,    ,    ,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,    ,    ,    ,    ,    ,         ,    ,    ,    ,    ,    ,
+|----+----+----+----+----+----|    |----+----+----+----+----+----|
+     ,    ,    ,    ,    ,    ,         ,    ,    ,    ,    ,   
+`----+----+----+----+----+----'    `----+----+----+----+----+----'
+```