[Keymap] sigma-squared (#11694)

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+# Signynt's Keymap: 'Sigma-Squared'
+
+Sigma Squared is an adaptation & modification of the Layout [Miryoku](https://github.com/manna-harbour/qmk_firmware/blob/miryoku/users/manna-harbour_miryoku/miryoku.org#miryoku-) by *manna-harbour*
+
+*manna-harbour* lays out the general principles of the layout as follows:
+
+- Use layers instead of reaching.
+- Use both hands instead of contortions.
+- Use the home positions as much as possible.
+- Make full use of the thumbs.
+- Avoid unnecessary complication.
+
+
+
+Sigma Squared modifies on **Miryoku** in the following ways:
+
+- Added the Mods to the outer most columns to be easily accessed while typing with the pinkies
+- Extended the **NUMBER** layer to include symbols on the right side to allow calcualtion to be typed more easily without haveing to move between layers
+- Added a **GAME** layer to be used for gaming that emulates a more standard keyboard that most games expect
+  - moves *left shift* and *left ctrl* down
+  - *esc* moved to top left
+  - gives access to a **SECOND GAME** layer that contains an Fn row as well as number and arrow keys right under your left fingers
+- Added Shortcuts to the bottom row to reduce the amount of keycombos needed to use commonly needed features
+  - Mission Control, Screenshot, Cycling Apps & Windows
+- Added LED indicators to display what layer is currently active (only active while RGB is turned on)
+
+
+
+### Flashing
+
+- to directly flash to board:
+
+  `qmk flash -kb bm40hsrgb -km signynt`
+
+- to only compile:
+
+  `qmk compile -kb bm40hsrgb -km signynt`
+
+
+
+# Layout
+
+## BASE
+
+Tap the layer keys to use the black legends, hold them to activate the corresponding layer.
+
+The Shortcut keys can be modified to suit your needs, or change them in your OS to match the keys.
+
+If you are using MacOS I recommend swapping your *Ctrl* and *Cmd* keys in system preferences
+
+The Music Control key can be pressed once to pause and be pressed twice in rapid succession to skip to the next song. 
+
+The Screenshot Key takes a screenshot to the clipboard if pressed once, if double tapped it will take a screenshot to be saved to the desktop.
+
+![img](https://i.imgur.com/vhb1L2f.png)
+
+## NAVIGATION
+
+Provides access to all essential navigation keys, comfortably under your home row. Modifiers remain identical to **BASE** layer to be used for navigating lines and words.
+
+*Game Layer* key takes you to the **GAME** layer. *(duh)*
+
+Bottom right keys are used to swap between Virtual Desktops. You might need to modify these to fit your OS.
+
+![img](https://i.imgur.com/daKxxFz.png)
+
+
+
+## MEDIA
+
+Provides access to all basic media keys, emulating the arrow keys on the home row.
+
+Also gives access to RGB controls.
+
+![img](https://i.imgur.com/1jWOvvH.png)
+
+## NUMBER
+
+Numbers are arranged in a numpad layout beneath home row, with 0 being positioned under the thumb resting position. Layer includes all most commonly needed symbols to reduce amount of layer switching needed to type longer calculations.
+
+Top right key changed to *Back Space* so corrections can be made without leaving layer.
+
+![img](https://i.imgur.com/LGJT3so.png)
+
+## SYMBOL
+
+Symbols are positioned over respective numbers from the **NUMBER** layer.
+
+Mouse keys are positioned similarly under the home row corresponding to the arrow keys.
+
+Also includes *Back Space* key for corrections.
+
+![img](https://i.imgur.com/ihOcdPj.png)
+
+## Fn
+
+Fn keys are arranged in the same layout as the numbers, with *F10* to *F12* added to the left
+
+![img](https://i.imgur.com/bPpI8KN.png)
+
+## GAME
+
+Somewhat emulates a regular layout needed for gaming. Top right key LED will indicate that you are on the **GAME** layer, and can be pressed to exit it. Holding one of the *Second Game* keys will give you access to **SECOND GAME**
+
+![img](https://i.imgur.com/r9KIWLX.png)
+
+## SECOND GAME
+
+Top right key will turn red to indicate you are in the layer
+
+![img](https://i.imgur.com/BLKHfVB.png)
+
+
+
+# Contact
+
+If you have any issues or questions you can reach me through Reddit at u/Signynt or on the QMK Discord