add Removed_Sources.md

[deividgabrielpeira]

It's good to keep track of all the extensions, so you don't have to talk about why they've been removed, deleted, etc...

But as I tried, at least I did it.

[ztimms73]

we can use the pinned issue, isn't it?

[deividgabrielpeira]

we can use the pinned issue, isn't it?

you can use the pins, I only made them as templates, you can even take this template and add it to the pins.

instead of using 2 pins, how about using just 1 pin?

just to keep things organized.

[Koitharu]

I suppose updating the pinned issue is simply in comparison to editing the md file.
However it would be useful to add link to this issue into readme, what do you guys think about it?