Update README and AUTHORS.

Kind of a test commit, but I also want to make the README a bit prettier.

Per #2 (comment),
I'm adopting this project. Thanks for your good maintainership and
original work, @dsboger! I'll try and take good care of Zimsearch.

.gitignore

@@ -2,3 +2,4 @@
 /.pydevproject
 /.settings/
 build
+*~

AUTHORS

@@ -1 +1,2 @@
 - Davi da Silva Böger <dsboger [at] gmail [dot] com>
+- Andrew Chadwick <[email protected]>

README.md

@@ -0,0 +1,37 @@
+# Zimsearch
+
+Authors: Davi da Silva Böger, Andrew Chadwick  
+GitHub: <https://github.com/achadwick/zimsearch>
+
+Zimsearch is a simple proof-of-concept implementation of a GNOME Shell
+search provider for Zim pages.
+
+**THIS IS VERY EARLY ALPHA SOFTWARE. USE AT YOUR OWN RISK**
+
+## Installation
+
+See [INSTALL][] for installation instructions.
+
+## Usage
+
+Search terms typed in the GNOME Shell overview are used to look up Zim
+pages from your notebooks. Page titles are matched against the search
+terms and only pages that contain all the terms are shown. By default,
+all notebooks are searched, but there is a plugin setting to limit the
+search to the default notebook only.
+
+It is also possible to limit the search to a certain notebook by adding
+a term preceded by a hash sign (`#`). Only notebooks whose names contain
+all the `#` terms are searched.
+
+New pages can be created by typing a complete page title, a little like
+[nvPY][]. By default the new page goes into your default notebook, but you
+can select others with `#` terms as above.
+
+## Bugs
+
+Please file bug reports or feature requests in github issue tracker.
+
+[INSTALL]: INSTALL
+[nvPY]: https://github.com/cpbotha/nvpy
+