Add performance comparisons in README

[MephistoMMM]

I wonder if the performance of your isolate is also better than evil-surround, embrace, siege-mode.

And the table head of your comparisons is wrong:

** [[https://github.com/cute-jumper/embrace.el][embrace]]

|           | evil-surround               | isolate      |     # embrace  vs  isolate

...

** [[https://github.com/tslilc/siege-mode][siege-mode]]

|           | evil-surround    | isolate        |               # siege-mode vs isolate

[casouri]

Thanks, I've fixed the table heads.

As of performance, do you mean the time needed for each operation?

[MephistoMMM]

Yes, I think features and real-time performance are taken all together when user decide to replace evil-surround and embrace etc.

[casouri]

Just to make sure, because I’ve never done any performance comparison, you mean “the time it takes to insert 1000 pairs by evil-surround vs by isolate”, or the like, right?

[MephistoMMM]

Maybe, I've never done any performance comparison yet. ╮(╯▽╰)╭

Let's go to ask hardcore players in emacs-China. (*￣︶￣)