doc: instructions of profiling with tracy.

[crupest]

Add documentation of instructions of profiling neovide with tracy.

This is the first time I write docs for public. Please point out any spelling or grammar mistakes or inappropriate voice, etc.

[fredizzimo]

Thank you, this is great, I have been thinking about writing this for a long time, so it's easier to ask for more information about performance releated problems.

[crupest]

Thank you, this is great, I have been thinking about writing this for a long time, so it's easier to ask for more information about performance releated problems.

That's why I write this. I have seen so many people report performance issue like FPS stuttering. But without some trace log, we can only do very limit things. So this should be a good start!

[fredizzimo]

Thank you!. This looks good, we can improve later, if it looks like people have problems following the instructions.

[falcucci]

this is great indeed!