Added new articles to the Integration with external systems section:
Use PXF JDBC connector to read and write data between Greengage DB and Oracle Database
Use PXF object store connector to read and write JSON data between Greengage DB and S3
Use PXF Object store connector to read and write Avro-format data between Greengage DB and S3
Use PXF object store connector to read and write Parquet-format data between Greengage DB and S3
Use PXF object store connector to read and write ORC-format data between Greengage DB and S3
Use PXF object store connector to read and write SequenceFile data between Greengage DB and S3
Use PXF object store connector to read and write fixed-width text between S3 and Greengage DB
Use PXF File connector to read and write data between NFS and Greengage DB