[Keymap] Custom Planck layout for the Planck (#7036)

* Version 1 of keymappings

* Adding updated keymappings

* Adding hash/pound symbol to layer

* Removing broken macros

* Adding to readme. Amending value of pound sign

* Changing language in readme

* Addressing PR comments. Removing unneeded code, corrected syntax

* Removing commented out code and fixing white space issues

* Small clean up to readme

keyboards/planck/keymaps/smittey/readme.md

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+# Planck Layout created by [Smittey](https://github.com/smittey) 
+
+A layout with a focus around coding, utilising the home row for symbols. There is an additional FN layer and Space function layer
+
+Main - Qwerty with ctrl swapped around and enter changed to be shift on hold
+Lower - Numbers and calculations
+Raise - Symbols
+Adjust - Keyboard settings and layout changers
+FN - Function keys
+Space FN - Navigation and media
+
+## Main
+![Main layer layout](https://i.imgur.com/jRbqGUN.png)
+
+## Lower
+![Lower layer layout](https://i.imgur.com/YmdM1q5.png)
+  
+## Raise
+![Raise layer layout](https://i.imgur.com/BXxOK1S.png)
+
+## Adjust
+![Adjust layer layout](https://i.imgur.com/M6qBaXO.png)
+
+## FN
+![FN layer layout](https://i.imgur.com/1eiUOH1.png)
+
+## Space Function
+![Space function layer layout](https://i.imgur.com/RJMFEdy.png)