Emphasizing the Issue and PR process

Applies to #60 and #167

@sizzlemctwizzle
Would you please skim over these additions and see if I missed anything or want something changed? I do have some grammar issues which are good to correct for translators... and I'll get to that in a bit.

I also have no idea what the `upstream` label means which is blocking the PR READY label for this... what is it?
"This label means that merging unrelated or non-bugfix PRs will be put on hold until this label has been removed."