Add a README

Author: tpope

README.markdown

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+# speeddating.vim
+
+Take the following date:
+
+    1999-12-31
+
+Because Vim treats the hyphen as a negative sign, pressing `<C-A>` on the 31
+would normally increment it to
+
+    1999-12-30
+
+Compare this with what happens when speeddating.vim is installed:
+
+    2000-01-01
+
+Pressing `5<C-X>` on the `03` in the first line below transforms it into the
+second:
+
+    Sat, 01 Jan 2000 00:00:03 +0000
+    Fri, 31 Dec 1999 23:59:58 +0000
+
+Several date, time, and datetime formats are included.  Additional formats can
+be defined in a strftime-like syntax with the `:SpeedDatingFormat` command.
+
+Existing Vim semantics are preserved.  `<C-A>` and `<C-X>` accept a count, and
+plain number incrementing is used if no date format is matched.
+
+Use of `<C-A>`/`<C-X>` in visual mode enables incrementing several lines at
+once.  Blank spots are filled by incrementing the match from the previous
+line, allowing for creation of sequences (1, 2, 3; 2000-10-30, 2000-10-31,
+2000-11-01).
+
+It can also increment roman numerals and ordinals (1st, 2nd, 3rd, ...).  In
+visual mode, letters of the alphabet are supported.
+
+`d<C-A>` sets the timestamp under the cursor to the current time.  `d<C-X>`
+does the same, but uses UTC rather than the local time.
+
+The `.` command will work as expected if you install
+[repeat.vim](https://github.com/tpope/vim-repeat).
+
+## Installation
+
+If you don't have a preferred installation method, I recommend
+installing [pathogen.vim](https://github.com/tpope/vim-pathogen), and
+then simply copy and paste:
+
+    cd ~/.vim/bundle
+    git clone git://github.com/tpope/vim-speeddating.git
+
+Once help tags have been generated, you can view the manual with
+`:help speeddating`.
+
+## Contributing
+
+See the contribution guidelines for
+[pathogen.vim](https://github.com/tpope/vim-pathogen#readme).
+
+## Self-Promotion
+
+Like speeddating.vim?  Follow the repository on
+[GitHub](https://github.com/tpope/vim-speeddating) and vote for it on
+[vim.org](http://www.vim.org/scripts/script.php?script_id=2120).  And if
+you're feeling especially charitable, follow [tpope](http://tpo.pe/) on
+[Twitter](http://twitter.com/tpope) and
+[GitHub](https://github.com/tpope).
+
+## License
+
+Copyright © Tim Pope.  Distributed under the same terms as Vim itself.
+See `:help license`.