Added Markup code tags to commands in Readme.md

Changed references to vimiim commands that were either in single-quotes or not otherwise distinguished easily to the reader as a command to be wrapped around backtick quotes so they will stand out. Here is a list of all changes made:

Line 92, the reference to ‘5t’ used to be in single quotes, is now `5t`.
Line 174, updated gU to `gU`.
Line 175, updated yt to `yt`.
Line 176, updated W to `W`.
Line 177, updated mX to `mX` and `X to `X`.
Line 228, updated “o” to `o`
Line 240, updated g0 to `g0` and g$ to `g$`
Line 241, updated p/P to `p`/`P`
Line 249, updated Tab to `Tab` and shift-tab to `shift-tab`.
Line 318, updated ‘u’ to `u`.
Line 320, updated ‘unmapAll’ to `unmapAll`.
Line 327, updated “?” to `?`.
Line 335, updated Ctrl+D to `Ctrl+D` and Ctrl+U to `Ctrl+U`.
Line 346, updated J to `J` and K to `K`.
Line 353, updated ‘gt’ to `gt` and ‘gT’ to `gT`.
Line 354, updated ‘yy’ to `yy`.
Line 356, updated Shift+F to `Shift+F`.
Line 357, updated ESC to `ESC` and ‘g’ to `g`.

No other changes have been made to this file, this update is intended to strictly improve readability.

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