Add Always Keep The Gutter Open as a Vim til

vim/always-keep-the-gutter-open.md

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+# Always Keep The Gutter Open
+
+Vim has an area off to the left where it can display information for specific
+lines in a buffer. This is sometimes called the gutter or the tray. In the Vim
+help files it is called the `signcolumn`. That names makes sense. It is a
+column to the left of the line numbers where _signs_ can be shown to indicate
+git status, type errors, and lint warnings.
+
+By default, the `signcolumn` is set to `auto` which means that as a sign
+appears, the column shifts open moving the editor text with it. When you've
+resolved whatever cause the sign to disappear, everything will shift back to
+the left.
+
+This jumpy layout shift can be avoiding by keeping the `signcolumn` always
+open. That's done by setting it to `yes` in your `~/.vimrc`.
+
+```vim
+set signcolumn=yes
+```
+
+See `:h signcolumn` for more details.