Add Set End Of Line Markers as a vim til.

vim/set-end-of-line-markers.md

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+# Set End Of Line Markers
+
+Vim has a number of invisible characters that you can set.
+One of those characters is the end of line (`eol`) character.
+Whatever character you
+set this to will appear at the end of each line in your file. This is great
+for highlighting extra whitespace at the end of a line that would otherwise
+appear invisible.
+
+Set the `eol` invisible character like so
+
+```
+:set listchars=eol:¬
+```
+
+or append it to the existing list of invisible characters like so
+
+```
+:set listchars+=eol:¬
+```
+
+See `:h listchars` to see what other invisible characters you can set.