Added CREDITS.txt and LICENSE.txt (finally!)

CREDITS.txt

@@ -0,0 +1,26 @@
+CREDITS
+=======
+
+The QTIWorks code is based on the earlier JQTI/QTIEngine and
+MathAssessEngine tools.
+
+The original JQTI/QTIEngine code was developed by Jiri Kajaba and
+Jonathon Hare, working for the University of Southampton. The JQTI+
+library in QTIWorks is derived from this original JQTI code and owes a
+great debt of gratitude to this original work.
+
+The remainder of the code in QTIWorks was largely developed by David
+Mckain, working for the University of Edinburgh. This includes some bits
+of MathAssessEngine, also largely developed by David McKain.
+
+Contribution to the development of Java files has been indicated using
+standard @author JavaDoc tags. I have tried where possible to attribute
+everyone involved where possible.
+
+This work has also benefited greatly from contributions and advice from
+the many people, in particular Sue Milne, Niall Barr, Graham Smith,
+Wilbert Kraan, Dick Bacon, Steve Lay, Zack Pierce and Jon Mason. (Sorry
+to anyone I've missed!)
+
+David McKain
+January 2014

LICENSE.txt

@@ -0,0 +1,40 @@
+The QTIWorks source code is distributed under the 3-clause BSD license,
+which is printed below this message. This license is famously liberal.
+However, you are strongly urged to contribute back to the QTI community -
+which relies on the goodwill of all involved - if you use or modify the
+QTIWorks source code. You must also comply with the individual licenses
+of any depedencies used by QTIWorks, such as Java software libraries.
+
+=======================================================================
+
+Copyright (c) 2014, University of Edinburgh
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+1. Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+notice, this list of conditions and the following disclaimer in the
+documentation and/or other materials provided with the distribution.
+
+3. Neither the name of the <ORGANIZATION> nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+===========================================================