duckdb: add page (#10549)

pages/common/duckdb.md

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+# duckdb
+
+> Command-line client for DuckDB, an in-process analytical SQL engine.
+> More information: <https://duckdb.org>.
+
+- Start an interactive shell with a transient in-memory database:
+
+`duckdb`
+
+- Start an interactive shell on a database file. If the file does not exist, a new database is created:
+
+`duckdb {{path/to/dbfile}}`
+
+- Directly query a CSV, JSON, or Parquet file:
+
+`duckdb -c "{{SELECT * FROM 'data_source.[csv|csv.gz|json|json.gz|parquet]'}}"`
+
+- Run a SQL script:
+
+`duckdb -c ".read {{path/to/script.sql}}"`
+
+- Run query on database file and keep the interactive shell open:
+
+`duckdb {{path/to/dbfile}} -cmd "{{SELECT DISTINCT * FROM tbl}}"`
+
+- Run SQL queries in file on database and keep the interactive shell open:
+
+`duckdb {{path/to/dbfile}} -init {{path/to/script.sql}}`
+
+- Read CSV from stdin and write CSV to stdout:
+
+`cat {{path/to/source.csv}} | duckdb -c "{{COPY (FROM read_csv_auto('/dev/stdin')) TO '/dev/stdout' WITH (FORMAT CSV, HEADER)}}"`
+
+- Display help:
+
+`duckdb -help`