Add lzma license (public domain)

Author: wtfsck

LICENSE.lzma.txt

@@ -0,0 +1,19 @@
+<LICENSE>
+LICENSE
+-------
+
+LZMA SDK is written and placed in the public domain by Igor Pavlov.
+
+Some code in LZMA SDK is based on public domain code from another developers:
+  1) PPMd var.H (2001): Dmitry Shkarin
+  2) SHA-256: Wei Dai (Crypto++ library)
+
+You can copy, modify, distribute and perform LZMA SDK code, even for commercial purposes,
+all without asking permission.
+
+LZMA SDK code is compatible with open source licenses, for example, you can
+include it to GNU GPL or GNU LGPL code.
+</LICENSE>
+
+http://www.7-zip.org/sdk.html
+http://downloads.sourceforge.net/sevenzip/lzma922.tar.bz2