Add web pages to resources.rst

In resources.rst, add links to the MIT Kerberos software and MIT
Kerberos Consortium web pages.

https://github.com/krb5/krb5/commit/58774a2c96b3c19368b48864698b97f6e020cae4
Author: Tom Yu <tlyu@mit.edu>
Commit: 58774a2c96b3c19368b48864698b97f6e020cae4
Branch: master
 doc/resources.rst |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)