Update README.md
Change to GNU LGPL v2.1

Update GNU license
Update license file and add missing file

1. Add missing file which is iRockey301_ccid-Prefix.pch
2. Update GNU license
3. Covert readme to pdf format
Create iRockey301_ccid-Prefix.pch file

Add iRockey301_ccid-Prefix.pch file, trying to through Github(Win) submit file to git sever, doesn't work, strange...
Update README.md
Merge pull request #1 from FeitianSmartcardReader/master

Update source code and license