improved README (adding licensing)

Author: pzaino

Readme

@@ -1,3 +1,11 @@
+# RiscLua
+RiscLua is a port to RISC OS of the Lua programming language. It differs from standard Lua in a few small details to be more conformant to RISC OS. The packaging of RiscLua has also varied. At one point it was a relocatable module, but it was found that error-handling was easier when packaged as an application.
+
+Lua license is included [here](LICENSE)
+Changes to Lua port for RISC OS are copyright Gavin Wraith and distributed under the same license as Lua original code (MIT license)
+
+
+## Status:
 RiscLua 86 (VFP)
 Based on Lua 5.4.3
 Compiler: GCC 4.7.4