Add a descriptive docstring to main cclib module
Add a descriptive docstring to main cclib module

andersx/cclib,ben-albrecht/cclib,langner/cclib,ATenderholt/cclib,andersx/cclib,Schamnad/cclib,Clyde-fare/cclib,cclib/cclib,berquist/cclib,langner/cclib,Schamnad/cclib,gaursagar/cclib,gaursagar/cclib,ghutchis/cclib,jchodera/cclib,jchodera/cclib,cclib/cclib,ghutchis/cclib,ben-albrecht/cclib,langner/cclib,ATenderholt/cclib,Clyde-fare/cclib,berquist/cclib,berquist/cclib,cclib/cclib