Add examples to readme #84

Job	Run time
Lint	11s
Test non-Linux (macos-latest, stable)	10s
Test Linux (stable, x86_64)	5s
Test non-Linux (macos-latest, stable, --features const-generics)	8s
Test Linux (stable, i686)	1m 3s
Test non-Linux (windows-latest, stable)	22s
Test Linux (stable, sparc64)	1m 3s
Test non-Linux (windows-latest, stable, --features const-generics)	7s
Test Linux (stable, --features const-generics, x86_64)	6s
Test Linux (stable, --features const-generics, i686)	59s
Test Linux (stable, --features const-generics, sparc64)	1m 6s
Test Linux (beta, x86_64)	13s
Test Linux (beta, i686)	1m 10s
Test Linux (beta, sparc64)	1m 5s
Test Linux (beta, --features const-generics, x86_64)	12s
Test Linux (beta, --features const-generics, i686)	1m 10s
Test Linux (beta, --features const-generics, sparc64)	1m 10s
Test Linux (nightly, x86_64)	13s
Test Linux (nightly, i686)	1m 6s
Test Linux (nightly, sparc64)	1m 4s
Test Linux (nightly, --features const-generics, x86_64)	12s
Test Linux (nightly, --features const-generics, i686)	1m 6s
Test Linux (nightly, --features const-generics, sparc64)	1m 13s
Test Linux (1.37.0, x86_64)	1m 51s
All Succeeded	2s
	17m 7s

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