Added parquet documentation (#939) #1253

Job	Run time
packages_split (src/core/etl, etl)	9s
packages_split (src/lib/array-dot, array-dot)	9s
packages_split (src/lib/doctrine-dbal-bulk, doctrine-dbal-bulk)	8s
packages_split (src/lib/parquet, parquet)	13s
packages_split (src/lib/parquet-viewer, parquet-viewer)	11s
packages_split (src/lib/dremel, dremel)	12s
packages_split (src/lib/rdsl, rdsl)	9s
packages_split (src/lib/snappy, snappy)	9s
packages_split (src/adapter/etl-adapter-avro, etl-adapter-avro)	8s
packages_split (src/adapter/etl-adapter-chartjs, etl-adapter-chartjs)	8s
packages_split (src/adapter/etl-adapter-csv, etl-adapter-csv)	12s
packages_split (src/adapter/etl-adapter-doctrine, etl-adapter-doctrine)	12s
packages_split (src/adapter/etl-adapter-elasticsearch, etl-adapter-elasticsearch)	10s
packages_split (src/adapter/etl-adapter-filesystem, etl-adapter-filesystem)	12s
packages_split (src/adapter/etl-adapter-meilisearch, etl-adapter-meilisearch)	9s
packages_split (src/adapter/etl-adapter-google-sheet, etl-adapter-google-sheet)	8s
packages_split (src/adapter/etl-adapter-http, etl-adapter-http)	10s
packages_split (src/adapter/etl-adapter-json, etl-adapter-json)	7s
packages_split (src/adapter/etl-adapter-logger, etl-adapter-logger)	9s
packages_split (src/adapter/etl-adapter-parquet, etl-adapter-parquet)	7s
packages_split (src/adapter/etl-adapter-text, etl-adapter-text)	9s
packages_split (src/adapter/etl-adapter-xml, etl-adapter-xml)	9s
packages_split (src/tools/homebrew, homebrew-flow)	9s
	3m 39s

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