chore(3p/emacs/exwm): Import from commit '0368127976'

Imported from 0368127976

git-subtree-dir: third_party/emacs/exwm
git-subtree-mainline: e84f9ef0ad
git-subtree-split: 0368127976
Change-Id: Id3af5610254180f42947d71265aad89def7c6a3d

third_party/emacs/exwm/README.md

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+# Emacs X Window Manager
+
+EXWM (Emacs X Window Manager) is a full-featured tiling X window manager
+for Emacs built on top of [XELB](https://github.com/ch11ng/xelb).
+It features:
++ Fully keyboard-driven operations
++ Hybrid layout modes (tiling & stacking)
++ Dynamic workspace support
++ ICCCM/EWMH compliance
++ (Optional) RandR (multi-monitor) support
++ (Optional) Builtin system tray
++ (Optional) Builtin input method
+
+Please check out the
+[screenshots](https://github.com/ch11ng/exwm/wiki/Screenshots)
+to get an overview of what EXWM is capable of,
+and the [user guide](https://github.com/ch11ng/exwm/wiki)
+for a detailed explanation of its usage.
+
+**Note**: If you install EXWM from source, it's recommended to install
+XELB also from source (otherwise install both from GNU ELPA).