Improve README (#17)

README.md

@@ -6,25 +6,53 @@ A [`git-worktree(1)`][git-worktree] manager.
 
 [git-worktree]: https://git-scm.com/docs/git-worktree/en
 
-## Features
-
 A normal Git checkout looks like this:
 
 ```
 my-repo/
-+ .git/
-+ README.md
-+ ...
+  .git/
+  README.md
+  ...
 ```
 
-A worktree checkout looks like this:
+Worktrees allow you to associate multiple checkouts with one `.git` directory,
+like this:
 
 ```
 my-repo/
-+ main/
-  + .git/
-  + README.md
-  + ...
-+ my-feature-branch/
-  + ...
+  .git/      # A bare repository
+  main/      # A checkout for the main branch
+    README.md
+  feature1/  # A checkout for work on a feature
+    README.md
+  ...
 ```
+
+This makes it a lot easier to keep a handful of branches 'in flight' at the
+same time, and it's often handy to be able to compare your work against a local
+checkout of the main branch without switching branches.
+
+Unfortunately, the built-in `git worktree` commands don't make it very easy to
+set up repositories with this layout. `git-prole` exists to paper over these
+deficiencies.
+
+## Features
+
+* Clone a repository into a worktree checkout with `git prole clone URL
+  [DESTINATION]`.
+
+* Convert an existing repository into a worktree checkout with `git prole
+  convert`.
+
+* Add a new worktree with `git prole add`.
+
+  * `git prole add feature1` will create a `feature1` directory next to the
+    rest of your worktrees; `git worktree add feature1`, in contrast, will
+    create a `feature1` subdirectory nested under the current worktree.
+
+  * Branches created with `git prole add` will start at and track the
+    repository's main branch by default.
+
+  * `git prole add` respects the `-c`/`--create` option (to match `git
+    switch`); `git worktree add` only allows `-b` (with no long-form option
+    available).