docs: add example for creating & fetching a collection #632

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	51s
Checking fmt	32s
Minimal Supported Rust Version	1m 7s
check_semver	1m 23s
codespell	6s
cargo deny	31s
Android Build Only (aarch64-linux-android)	1m 11s
Cross Test (i686-unknown-linux-gnu)	5m 44s
Android Build Only (armv7-linux-androideabi)	1m 11s
clippy_check	1m 11s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	1s
Checking docs	1m 15s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	1m 9s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	1s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1s
CI Test Suite / Tests (ubuntu-latest, stable, all)	13m 6s
CI Test Suite / Tests (ubuntu-latest, stable, none)	1s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1s
	29m 24s

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