Added bigquery directory.
Added bigquery directory.

EricYangzhiHong/python-docs-samples,raybuhr/python-docs-samples,BrandonY/python-docs-samples,canglade/NLP,BrandonY/python-docs-samples,marcomaccio/python-docs-samples,BrandonY/python-docs-samples,BrandonY/python-docs-samples,GoogleCloudPlatform/python-docs-samples,marcomaccio/python-docs-samples,canglade/NLP,sharbison3/python-docs-samples,JavaRabbit/CS496_capstone,hashems/Mobile-Cloud-Development-Projects,raybuhr/python-docs-samples,sharbison3/python-docs-samples,sharbison3/python-docs-samples,GoogleCloudPlatform/python-docs-samples,hashems/Mobile-Cloud-Development-Projects,marcomaccio/python-docs-samples,JPO1/python-docs-samples,JavaRabbit/CS496_capstone,hashems/Mobile-Cloud-Development-Projects,JavaRabbit/CS496_capstone,GoogleCloudPlatform/python-docs-samples,kocicjelena/python-docs-samples,GoogleCloudPlatform/python-docs-samples,sharbison3/python-docs-samples,marcomaccio/python-docs-samples,JavaRabbit/CS496_capstone,JPO1/python-docs-samples,hashems/Mobile-Cloud-Development-Projects,canglade/NLP,canglade/NLP