Add Replace A Character as a vim til.

README.md

@@ -154,6 +154,7 @@ smart people at [Hashrocket](http://hashrocket.com/).
 - [Re-indenting Your Code](vim/reindenting-your-code.md)
 - [Rename Current File](vim/rename-current-file.md)
 - [Repeat The Previous Change](vim/repeat-the-previous-change.md)
+- [Replace A Character](vim/replace-a-character.md)
 - [Scrolling Relative to the Window](vim/scrolling-relative-to-the-window.md)
 - [Set Your Color Scheme](vim/set-your-color-scheme.md)
 - [Split Different](vim/split-different.md)

vim/replace-a-character.md

@@ -0,0 +1,13 @@
+# Replace A Character
+
+Throughout the day I'll often find myself deleting a single character and
+putting a different one in its place. I usually navigate over the target
+character and hit `s` which removes the character under the cursor and puts
+me in insert mode. From there I type the new character and hit escape to
+return to normal node. This isn't the best way to perform such an edit
+though. Vim has a command specifically for replacing a character. The `r`
+command. It does essentially the same thing as my current approach but
+instead of putting me in insert mode, it simply replaces the character and
+leaves me in normal node.
+
+See `:h r` for more details.