Move usage documentation from wiki to BAUKE_DIR.

.bauke/Usage.md

@@ -0,0 +1,49 @@
+# Dotfiles
+
+## Setup & Usage
+
+Create a directory that'll act as the bare git directory, then initialize it using `$HOME` as the working tree.
+
+```
+mkdir $HOME/.dotfiles
+git init --bare $HOME/.dotfiles
+```
+
+To manage it, use `GIT_DIR` and `GIT_WORK_TREE`. Preferably as an alias.
+
+```
+alias dotfiles="GIT_DIR=$HOME/.dotfiles GIT_WORK_TREE=$HOME"
+```
+
+From there, prefix `dotfiles` to any commands that recognize these variables.
+
+```
+# Git
+dotfiles git add .zshrc
+dotfiles git status
+# VS Codium
+dotfiles codium
+# ...
+```
+
+Hide untracked files from `dotfiles git status`, otherwise everything in `$HOME` will show up.
+
+```
+dotfiles git config --local status.showUntrackedFiles no
+```
+
+For VS Codium, create `$HOME/.vscode/settings.json`.
+
+```
+{
+  "git.untrackedChanges": "hidden"
+}
+```
+
+## Subtleties
+
+### Can't add files from git repositories
+
+For example, since `.oh-my-zsh` is a git repository, files inside `.oh-my-zsh/custom` can't be added. But since they're just scripts like any other, place them directly inside `$HOME` (or anywhere else) and `source <file>` them in `.zshrc` manually.
+
+Another solution is to set `$ZSH_CUSTOM` to something outside the `$ZSH` directory.