Added a readme page.

README.md

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+#![Boost.Core]
+
+Boost.Core, part of collection of the [Boost C++ Libraries](http://github.com/boostorg), is a collection of core utilities used by other Boost libraries.
+The criteria for inclusion is that the utility component be:
+
+* simple,
+* used by other Boost libraries, and
+* not dependent on any other Boost modules except Core itself, Config, Assert, Static Assert, or Predef.
+
+### Directories
+
+* **doc** - Documentation of the components
+* **include** - Interface headers
+* **test** - Unit tests
+
+### More information
+
+* [Documentation](http://boost.org/libs/core)
+
+### License
+
+Distributed under the [Boost Software License, Version 1.0](http://www.boost.org/LICENSE_1_0.txt).