Include CRC32 in benchmarks on website

Looking at benchmarks table on main website I noticed lack off most popular check sum on internet, namely CRC32. Although it's not a hash but checksum but 'bandwidth speed' in this table refers to hashes being used add check sums, hence proposition to include CRC.

[Here](https://paste.ee/p/qUxbgCIc) is improvised patch with it.

Also, suggetion to a bench - every test should anounce units it uses, as these numbers don't mean much, if anything, without it.

~~~
benchmarking large inputs : from 512 bytes (log9) to 128 MB (log27) [MB/s]:
Throughput small inputs of fixed size (from 1 to 30 bytes) [#/s]:
benchmarking random size inputs [1-N] ???:
~~~

Start with the benchmark table on the main website and the improvised patch linked in the issue; the payload does not identify source files or tests. Done means CRC32 is included in the displayed benchmarks and the listed measurements clearly state their units.

Written by the indexing model from the issue text.