docs: add "Getting Started" section to the README and add the readme … #105

Job	Run time
Cross Build Only (x86_64-unknown-freebsd)	43s
Checking docs	2m 22s
Checking fmt	24s
cargo deny	46s
Android Build Only (aarch64-linux-android)	1m 8s
check_semver	2m 26s
Android Build Only (armv7-linux-androideabi)	1m 10s
clippy_check	3m 16s
codespell	4s
Minimal Supported Rust Version	18s
Cross Test (i686-unknown-linux-gnu)	1m 3s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 46s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 30s
CI Test Suite / Tests (ubuntu-latest, stable, none)	35s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 18s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 24s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 4s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	31s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	55s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 37s
	25m 20s

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