added a description to the README file
Added Pluto
Added more stuff to pluto 3
add nukefreezer
Merge branch 'nukefreezer' into pluto

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Added the background for the nukefreezer
Merge branch 'outer_planets' into pluto
Merge branch 'pluto' into outer_planets
Merge branch 'outer_planets' of github.com:myano/891-planets into outer_planets