tools/coredumper: need debug wiki about how to use it

[xiulipan]

Need wiki about how to use the tools/coredumper. Some example or pic result will be helpful.

[jajanusz]

I think @mwierzbix made it, but he no longer contributes to the project. Maybe @bkokoszx or @akloniex may write docs for it

[abonislawski]

docs page: PR #101

[kv2019i]

The new readme is good for the tool part, but what seems to be still missing is some specification of the expected input dump file content and layout. Feeding dumps from Linux debugfs do not seem to work at least in my environment.

[lgirdwood]

@kv2019i see thesofproject/sof#1335. I'm no python guru, but I have some initial work that helps but does not fully fix support for GDB. I think @ranj063 also has GDB fixes she has still to upstream.