Add feature tracker to project list

[alexanderlhicks]

Hi!

This pull request is intended to add a feature tracker to the project list. So far I've considered listing ISAs and support for continuations & parallel proving (considering both together), GPUs, languages, and precompiles. Now that there are an increasing amount of zkVMs reaching some level of maturity, it's getting harder to track these, and this seems like a good place to try and collect this information. The current entries are incomplete and might be off in some cases -- someone else is more likely to see this PR here than on my fork, and fill in the gaps accordingly.
Adding this will also require a bit of maintenance and support for difference features will change with time. It could be worth considering adding a timestamp of the last time the table is updated to avoid any confusion caused by out of date information.

[rkdud007]

Hi! first idea of having table and various fields to compare is really great idea. I'd like to have standard to identify if it support or not base on public github repositories code.

So based on my own research thru repository, i got some information to fill out the table (pointed on comment, but I might be wrong)+ I want to add one more field of note( some projects are fork or used others) + want to add proving backend field ( plonky3, stwo, gkr, nova, jolt, hyper nova, halo2 etc ) + language is we can actually say as proving frontend

• one concern: GPU field maybe too tied to proving not necessarily for zkvm?