docs: add "Getting Started" section to the README and add the readme to the docs #103

Job	Run time
Android Build Only (aarch64-linux-android)	1m 8s
Android Build Only (armv7-linux-androideabi)	1m 8s
cargo deny	30s
Checking docs	1m 39s
Checking fmt	28s
check_semver	1m 51s
clippy_check	2m 46s
codespell	6s
Cross Build Only (x86_64-unknown-freebsd)	45s
Cross Test (i686-unknown-linux-gnu)	1m 3s
Minimal Supported Rust Version	19s
CI Test Suite / Tests (ubuntu-latest, stable, all)	1m 28s
CI Test Suite / Tests (ubuntu-latest, stable, none)	36s
CI Test Suite / Tests (ubuntu-latest, stable, default)	1m 4s
CI Test Suite / Tests (windows-latest, stable, all, x86_64-pc-windows-msvc)	2m 37s
CI Test Suite / Tests (windows-latest, stable, none, x86_64-pc-windows-msvc)	1m 4s
CI Test Suite / Tests (macOS-arm-latest, stable, all)	1m 25s
CI Test Suite / Tests (windows-latest, stable, default, x86_64-pc-windows-msvc)	1m 38s
CI Test Suite / Tests (macOS-arm-latest, stable, none)	32s
CI Test Suite / Tests (macOS-arm-latest, stable, default)	54s
	23m 1s

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