Add Format The Current File Within Vim as a reason til

reason/format-the-current-file-within-vim.md

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+# Format The Current File Within Vim
+
+I'm editing a `.re` file within Vim. I haven't yet wired up `refmt` to
+something like [ALE](https://github.com/w0rp/ale) for automatic formatting
+on save. By the time I'm done with my changes, indentation is a mess.
+
+I can still take advantage of `refmt` to clean up my file.
+
+```
+:!refmt --in-place %
+```
+
+Running that command in Vim will cause the current file to be formatted.
+
+How does it work?
+
+It shells-out to `refmt` which does all the heavy lifting. The `--in-place`
+flag means that the target file will be re-written by the formatted result.
+The `%` is a handy Vim shorthand for the path and name of the current file.