Added some more explanation to demo.
Added some more explanation to demo.

nmrugg/LZMA-JS,zzzhan/LZMA-JS,addaleax/LZMA-JS,nmrugg/LZMA-JS,nmrugg/LZMA-JS,addaleax/LZMA-JS,addaleax/LZMA-JS,zzzhan/LZMA-JS,zzzhan/LZMA-JS