improve plugins readme

[WuTheFWasThat]

first off, thanks for the 2.0.0 update to spacevim - it looks great!

I'm writing to nitpick about the PLUGINS.md presentation. I don't know what the right answer is, but I'm just writing to inform you of some uncertainties I encountered.

• Are all plugins technically optional?
• I'm not familiar with editorconfig-vim, but it seems unrelated to replicating spacemacs behavior, right?
• vim-arpeggio also looks really cool, but what does it have to do with the git plugin?
  I'm okay with my spacevim set up already, but a newcomer might have trouble deciding what plugins to add.

Maybe it also makes sense to sort by layer instead of by plugin - that way a user can easily decide, for example, to not include the git layer at all.
It could also be really useful to have a brief description column, perhaps.

[ctjhoa]

Are all plugins technically optional?

Yes

I'm not familiar with editorconfig-vim, but it seems unrelated to replicating spacemacs behavior, right?

Yes I made a mistake as I use it all the time. I forgot that it needs to be add in addition-package in spacemacs

vim-arpeggio also looks really cool, but what does it have to do with the git plugin?

You're also right, copy/paste mistake.

Maybe it also makes sense to sort by layer instead of by plugin - that way a user can easily decide, for example, to not include the git layer at all.

Yeah. I'm think I'm gonna rework this.

[ctjhoa]

I've done some progress tell me what you think of that

[ctjhoa]

editorconfig is removed in dev branch

[WuTheFWasThat]

looks better!