Add a README explaining the backpressure

[backuitist]

It's not complete but perhaps a good starting point :)

[codecov]

Codecov Report

Merging #84 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #84   +/-   ##
=======================================
  Coverage   98.34%   98.34%           
=======================================
  Files          34       34           
  Lines         725      725           
  Branches       51       51           
=======================================
  Hits          713      713           
  Misses         12       12

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[backuitist]

I thought that the site would contain user focused documentation, whereas the README would contain instructions for contributors. I like when you don't have to click around to find the information :)
Feel free to move this to the documentation if you disagree though :)

[vlovgr]

Thanks a lot for this, @backuitist! I believe it's nice to have all high-level documentation in one place. I'll take a stab at moving this to the site and adding some notes from myself as well, when I get some time.

[backuitist]

Neat! Thanks!