Added a readme. Added myself as a maintainer.

README.md

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+# Boost.Integer
+
+Boost.Integer, part of collection of the [Boost C++ Libraries](http://github.com/boostorg), provides
+integer type support, particularly helpful in generic programming. It provides the means to select
+an integer type based upon its properties, like the number of bits or the maximum supported value,
+as well as compile-time bit mask selection. There is a derivative of `std::numeric_limits` that provides
+integral constant expressions for `min` and `max`...
+Finally, it provides two compile-time algorithms: determining the highest power of two in a.
+compile-time value; and computing min and max of constant expressions.
+
+### Directories
+
+* **doc** - QuickBook documentation sources
+* **include** - Interface headers of Boost.Integer
+* **test** - Boost.Atomic unit tests
+
+### More information
+
+* [Documentation](http://boost.org/libs/integer)
+* [Report bugs](https://github.com/boostorg/integer/issues/new). Be sure to mention Boost version, platform and compiler you're using. A small compilable code sample to reproduce the problem is always good as well.
+* Submit your patches as pull requests against **develop** branch. Note that by submitting patches you agree to license your modifications under the [Boost Software License, Version 1.0](http://www.boost.org/LICENSE_1_0.txt).
+
+### License
+
+Distributed under the [Boost Software License, Version 1.0](http://www.boost.org/LICENSE_1_0.txt).