Add Navigating By Blank Lines as a vim til.

vim/navigating-by-blank-lines.md

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+# Navigating By Blank Lines
+
+Use vim to open a file full of code (or text) that has some blank lines.
+Move the cursor to the middle of the file. Then start hitting `{` or `}`.
+You'll see that the cursor jumps from blank line to blank line.
+
+Use `{` to jump to the closest blank line _behind_ the cursor. Use `}` to
+jump to the closest blank line _ahead_ of the cursor.
+
+This may not seem like the most practical or obvious way to navigate around,
+but can help move you around a bit quicker than tapping `k` and `j`.