Add README and CONTRIBUTING files

CONTRIBUTING.md

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+Guidelines for Contributing
+===========================
+
+Welcome to the D community and thanks for your interest in contributing!
+
+# [How to contribute pull requests?](http://wiki.dlang.org/Pull_Requests)
+
+# More Links
+
+* Fork [on Github](https://github.com/D-Programming-Language/phobos)
+* Use our [Bugzilla bug tracker](http://d.puremagic.com/issues/)
+* Follow the [Styleguide](http://dlang.org/dstyle.html)
+* Participate in [our forum](http://forum.dlang.org/)
+* [Review Queue](http://wiki.dlang.org/Review_Queue).
+
+
+Tips for Development
+--------------------
+
+1. Build and test (e.g. the regex module)
+
+        rdmd -unittest -main std/regex.d
+
+2. Do not forget to test your changes.
+   Aim for a [high code coverage of your tests](http://forum.dlang.org/thread/ki5ovr$17m1$1@digitalmars.com).
+
+3. Do not forget the [API Documentation](http://dlang.org/phobos/).

README.md

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+![D Logo](http://dlang.org/images/dlogo.png) Phobos Runtime Library
+===================================================================
+
+Phobos is the standard runtime library that comes with the
+[D Programming Language](http://dlang.org) Compiler.
+
+
+* [Bugzilla bug tracker](http://d.puremagic.com/issues/)
+* [Forum](http://forum.dlang.org/)
+* [API Documentation](http://dlang.org/phobos/)
+* [Wiki](http://wiki.dlang.org/)
+
+Download
+--------
+
+Phobos packaged together with the compiler.
+You should
+[download the whole precompiled package](http://dlang.org/download.html).
+
+To [build everything yourself](http://wiki.dlang.org/Building_DMD),
+there is a [description in the wiki](http://wiki.dlang.org/Building_DMD).
+
+Phobos is distributed under Boost Software Licence.
+See the [licence file](LICENSE_1_0.txt).
+
+I Want to Contribute
+--------------------
+
+Great!
+See the [CONTRIBUTING.md file](CONTRIBUTING.md).
+