Update readme and add license

LICENSE

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+Copyright (c) <2013> <Jari Vetoniemi>
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+   1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+
+   2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+
+   3. This notice may not be removed or altered from any source
+   distribution.

README

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+# pi9
+
+9p server abstraction library
+
+## Building
+
+    mkdir target && cd target                # - create build target directory
+    cmake -DCMAKE_INSTALL_PREFIX=build ..    # - run CMake, set install directory
+    make                                     # - compile
+
+## License
+
+zlib, see LICENSE file for more information