Add "Parley text stack" section. #127

Job	Run time
cargo check (msrv) (windows-latest)	1m 38s
cargo check (msrv) (macos-14)	55s
cargo clippy (android) (armv7-linux-androideabi)	59s
cargo clippy (windows-latest)	2m 21s
cargo check (msrv) (ubuntu-latest)	45s
cargo clippy (android) (aarch64-linux-android)	58s
cargo check (msrv) (android) (armv7-linux-androideabi)	41s
cargo clippy (android) (x86_64-linux-android)	1m 1s
cargo clippy (macos-14)	1m 6s
cargo check (msrv) (android) (aarch64-linux-android)	38s
cargo clippy (ubuntu-latest)	1m 2s
cargo doc (windows-latest)	1m 5s
cargo check (msrv) (android) (x86_64-linux-android)	42s
cargo fmt	18s
cargo doc (macos-14)	49s
cargo doc (ubuntu-latest)	41s
cargo test (windows-latest)	1m 20s
cargo test (macos-14)	1m 31s
cargo test (ubuntu-latest)	39s
	19m 9s

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