Create Shortcuts.md

Since this seems a bit long for readme.md but still worth having, here it is as a separate file

Shortcuts.md

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+# List of the LaTeX Workshop Keyboard Shortcuts
+
+### Quick Note
+The shortcuts are given using [Emacs Key Notation](https://www.emacswiki.org/emacs/EmacsKeyNotation), so `C` is used to represent `ctrl`/`cmd`, so `C-c` represents `ctrl+c`/`cmd+c` etc.
+
+## Extension Commands
+
+| Shortcut | Does                               |
+| -------- | ---------------------------------- |
+| `C-M-b`  | Builds current file                |
+| `C-M-v`  | Opens correspanding PDF            |
+| `C-M-j`  | Synctex from cursor (windows only) |
+| `C-M-x`  | Open Extension Sidebar             |
+
+
+## Miscilanious Actions
+| Shortcut    | Does                     |
+| ----------- | ------------------------ |
+| `C-l C-RET` | Insert `\item`           |
+
+
+## Font Selection
+| Shortcut #1 | Shortcut #2 | Does            |
+| ----------- | ----------- | --------------- |
+| `C-b`       | `C-l C-b`   | Bold text       |
+| `C-i`       | `C-l C-i`   | Italic Text     |
+| `C-u`       | `C-l C-u`   | Underline       |
+| `C-r`       | `C-l C-r`   | Roman Text      |
+| `C-e`       | `C-l C-e`   | Emphasised Text |
+| `C-t`       | `C-l C-t`   | Typewriter Text |
+| `C-s`       | `C-l C-s`   | Slanted Text    |
+|             | `C-l C-c`   | Small Caps Text |
+|             | `C-l C-l`   | Lowercase       |
+|             | `C-l C-u`   | Uppercase       |
+
+_NB: Shortcut #1 is only active when text is selected, Shortcut #2 works all the time_
+
+### Other text formatting
+
+| Shortcut      | Command            | 
+| ------------- | ------------------ |
+| `C-l C-6`     | `\textsuperscript` |
+| `C-l C-minus` | `\textsubscript`   |
+
+_Why the `6` and `minus`? Because they are the same keys for `^` and `_`._
+
+## Math Font Selection
+| Shortcut    | Does                  |
+| ----------- | --------------------- |
+| `C-m C-S-b` | Blackboard Font (𝔹)   |
+| `C-m C-c`   | Calligraphic Font (𝓒) |
+| `C-m C-f`   | Frak Font (𝔉)         |
+| `C-m C-b`   | Bold                  |
+| `C-m C-i`   | Italic                |
+| `C-m C-r`   | Roman                 |
+| `C-m C-t`   | Typewriter            |
+| `C-m C-s`   | Sans Serif            |