Updated README.

README.md

-SExtractor stands for ``Source Extractor'': a software for making
-catalog of sources from astronomical images.
-The SExtractor homepage is http://astromatic.net/software/sextractor
-In case of problems, questions or suggestions related to the software, please
-refer to the SExtractor forum:
-http://astromatic.net/forum
-
-					Emmanuel Bertin <bertin@iap.fr>.
+# SExtractor
+
+[![Build Status](https://travis-ci.org/astromatic/sextractor.svg?branch=master)](https://travis-ci.org/astromatic/sextractor)
+[![Coverity Scan Build Status](https://scan.coverity.com/projects/astromatic-sextractor/badge.svg)](https://scan.coverity.com/projects/astromatic-sextractor "Coverity Badge")
+
+[SExtractor] stands for ``Source Extractor'': a software for extractingcatalog of sources from astronomical images.
+
+Check out the on-line [documentation], the [official web page], and the [user forum].
+
+[SExtractor]: http://astromatic.net/software/sextractor
+[documentation]: http://sextractor.readthedocs.org
+[official web page]: http://astromatic.net/software/sextractor
+[user forum]: http://astromatic.net/forum/forumdisplay.php?fid=4