adding doc #326

Job	Run time
Check cargo fmt	53s
cargo check	8m 23s
build with wasm-pack	2m 26s
cargo test (macos)	7m 39s
cargo test (macos-aarch64)	7m 4s
Verify MSRV (Min Supported Rust Version)	6m 22s
Verify Vendored Code	53s
cargo test (win64)	36m 37s
cargo test datafusion-cli (amd64)	4m 2s
cargo examples (amd64)	12m 43s
check Cargo.toml formatting	2m 57s
clippy	5m 2s
check configs.md is up-to-date	2m 40s
cargo test hash collisions (amd64)	13m 43s
cargo doc	3m 58s
cargo test (amd64)	9m 23s
cargo test doc (amd64)	14m 9s
Run sqllogictest with Postgres runner	3m 28s
cargo test pyarrow (amd64)	2m 52s
verify benchmark results (amd64)	11m 2s
	2h 36m 16s

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