Revert "Remove xcape/xmodmap"

Similar to the other revert commits, I may want to do some programming
in xorg, where xcape and xmodmap are useful.

xmodmap/.xmodmap

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+! New Start: A modern Arch workflow built with an emphasis on functionality.
+! Copyright (C) 2017-2018 Donovan Glover
+
+! Clear both the caps lock and control keys
+clear lock
+clear control
+
+! Set the caps lock key to Control_L
+keycode 66 = Control_L
+
+! Reassign the control command to the caps lock and control keys respectively
+add control = Caps_Lock Control_L Control_R

xmodmap/README.md

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+# xmodmap
+
+[xmodmap][xmodmap] is used to change the functionality of keys on your keyboard.
+
+## Use Cases
+
+xmodmap can be used to:
+
+- Make Caps Lock function as Ctrl when held down
+- Used with [xcape][xcape] to make Caps Lock function as Escape when pressed
+
+You should not use xmodmap if:
+
+- You do not need to modify keys
+
+## Usage
+
+Run `xmodmap ~/.xmodmap` in one of your init scripts to make Caps Lock function as Ctrl when held down.
+
+Then, use `xcape -e 'Control_L=Escape'` to make Caps Lock (left Ctrl) function as Escape when pressed.
+
+[xmodmap]: https://wiki.archlinux.org/index.php/Xmodmap
+[xcape]: https://github.com/alols/xcape