Add Default netrw To Tree Liststyle as a vim til

vim/default-netrw-to-tree-liststyle.md

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+# Default netrw To Tree Liststyle
+
+The built-in `netrw` plugin is a great way to browse files and directories
+within a Vim session. `netrw` supports four ways of displaying files and
+directories. That is, there are four liststyles. You can toggle through
+these by hitting `i`.
+
+I prefer the tree liststyle, which is not the default. I can set the tree
+liststyle as the default by adding the following line to my `.vimrc` file.
+
+```vimscript
+let g:netrw_liststyle = 3
+```
+
+Now, every time I visit or revisit a `netrw` window, I'll see everything
+nicely displayed as a tree.