Initial README.md, including Travis-CI information

Author: tautschnig

README.md

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+[![Build Status][build_img]][travis]
+
+About
+=====
+
+CBMC is a Bounded Model Checker for C and C++ programs. It supports C89, C99,
+most of C11 and most compiler extensions provided by gcc and Visual Studio. It
+also supports SystemC using Scoot. It allows verifying array bounds (buffer
+overflows), pointer safety, exceptions and user-specified assertions.
+Furthermore, it can check C and C++ for consistency with other languages, such
+as Verilog. The verification is performed by unwinding the loops in the program
+and passing the resulting equation to a decision procedure.
+
+For full information see [cprover.org](http://www.cprover.org/cbmc).
+
+License
+=======
+4-clause BSD license, see `LICENSE` file.
+
+[build_img]: https://travis-ci.org/tautschnig/cbmc.svg?branch=master
+[travis]: https://travis-ci.org/tautschnig/cbmc