Added WebFonts API Sample

I added WebFonts API sample on github. The sample is listing available font families.

https://github.com/comewalk/google-api-perl-client/blob/master/eg/webfonts/cli_public_access.pl

You can try the sample like below.

 # Edit Simple API Access Key instead <YOUR API KEY>
 $ vim eg/webfonts/cli_public_access.pl
 $ perl -I lib eg/webfonts/cli_public_access.pl

Also, I updated sample wiki page.

Enjoy!