Add some dev docs

assets/devel/shell-shortcuts.txt

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+Ctrl + A : Go to the beginning of the line you are currently typing on
+Ctrl + E : Go to the end of the line you are currently typing on
+Ctrl + L : Clears the Screen, similar to the clear command
+Ctrl + U : Clears the line before the cursor position. If you are at the end of
+           the line, clears the entire line.
+Ctrl + H : Same as backspace
+Ctrl + R : Let’s you search through previously used commands
+Ctrl + C : Kill whatever you are running
+Ctrl + D : Exit the current shell
+Ctrl + Z : Puts whatever you are running into a suspended background process. 
+           fg restores it.
+Ctrl + W : Delete the word before the cursor
+Ctrl + K : Clear the line after the cursor
+Ctrl + T : Swap the last two characters before the cursor
+Esc  + T : Swap the last two words before the cursor
+Alt  + F : Move cursor forward one word on the current line
+Alt  + B : Move cursor backward one word on the current line
+
+Tab Auto-complete files and folder names