Add Search Backward Through A File as a vim til

vim/search-backward-through-a-file.md

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+# Search Backward Through A File
+
+There are a number of ways to search for a match in a file. One I use quite
+often is hitting `*` while the cursor is over the word I want to find
+matches for. It searches forward jumping to the next occurrence of that
+word.
+
+It turns out there is a way of doing the same thing, but searching backward
+to the previous occurrence of the word. If you hit `#` with the cursor over
+a word, it will jump backward through the file until it finds an occurrence
+of that word. Keep hitting `#` to keep searching backward.
+
+See `:h #` for more details.