doc: python bindings example README
doc: python bindings example README

* Added the same license as used with the HOWTO.
* Since these examples are so basic, they'll be dual licensed the same
  as GPGME itself (otherwise it would slip too dangerously against the
  need for permissive licensing of crypto libraries).

gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme,gpg/gpgme