Add clang-tidy configuration file
Add clang-tidy configuration file

This can be used with CMake as follows:
$ cmake -DCMAKE_CXX_CLANG_TIDY=<path to clang-tidy tool> ..

Note: this requires CMake v3.6 or above

Co-authored-by: Marco Magdy <de764478e116264c38f5fc759ae6709906a9736a@amazon.com>
aws/aws-sdk-cpp,aws/aws-sdk-cpp,awslabs/aws-sdk-cpp,aws/aws-sdk-cpp,aws/aws-sdk-cpp,awslabs/aws-sdk-cpp,cedral/aws-sdk-cpp,cedral/aws-sdk-cpp,awslabs/aws-sdk-cpp,cedral/aws-sdk-cpp,aws/aws-sdk-cpp,cedral/aws-sdk-cpp,aws/aws-sdk-cpp,cedral/aws-sdk-cpp,cedral/aws-sdk-cpp,awslabs/aws-sdk-cpp