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?
> ... when someone assigns themselves to an issue (especially when they wrote a good deal of the code that is affected and it isn't a critical issue) they should be given time to present their solution. If you want to help them out, push your code to a branch and let them know about it, but don't go behind their back and submit a PR. It just isn't polite.

I feel like this idea needs to be here but it probably needs to be trimmed down some.