adding description field to setup.py

Author: mattsb42-aws

setup.py

@@ -35,6 +35,7 @@ def get_requirements():
     author='Amazon Web Services',
     author_email='[email protected]',
     maintainer='Amazon Web Services',
+    description='This command line tool can be used to encrypt and decrypt files and directories using the AWS Encryption SDK.',
     long_description=read('README.rst'),
     keywords='aws-encryption-sdk aws kms encryption cli command line',
     data_files=[