Add Format Long Lines To Text Width as a vim til.

vim/format-long-lines-to-text-width.md

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+# Format Long Lines To Text Width
+
+Vim allows you to set the maximum width for text per line in a buffer. For
+example, you can set the maximum text width to 80 characters like so:
+
+```
+:set textwidth=80
+```
+
+With this set, vim will automatically break on whitespace whenever you hit
+80 characters. There are two places where this doesn't quite pan out. You
+will see this as soon as you open a file with lines of text that exceed 80
+characters and when you paste long lines of text into your buffer. You can
+quickly remedy this with `gw`.
+
+Make a visual selection of the lines that need formatting and then hit `gw`.
+All the lines should then we truncated to 80 or less characters.