Add license and readme

LICENSE

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+Copyright 2002-2010 Ryan Leavengood
+Copyright 2011 Peter Poláčik
+Copyright 2013 Siarzhuk Zharski
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+Description
+===========
+
+The Jamfile engine allows developers to easily build their Haiku applications using Jam.
+
+Jam is a non-compatible replacement for Make, which is more geared towards generic and reusable
+rules and actions, and making the task of writing a build system easier.
+
+Usage
+=====
+
+Install the jamfile_engine package on your Haiku machine.
+
+Copy the provided Jamfile next to your sources. Edit it and fill it in as needed. Then type "jam"
+to compile your application.