README: GPU comparison table + German version + full feature inventory #155

Job	Run time
clippy/stable	21s
Pass MSRV values to other jobs	3s
nostd/thumbv6m-none-eabi/stable	31s
format/stable	18s
native-backend/stable	40s
cross_test/i686-unknown-linux-gnu/stable	1m 34s
cross_test/s390x-unknown-linux-gnu/stable	1m 35s
docs/nightly	0s
miri	0s
cargo-careful	0s
blas-msrv	1m 2s
tests/stable	49s
tests/1.64.0	1m 3s
tests/beta	1m 3s
conclusion	0s
	8m 59s

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