Added input validation
Added in-game mod link

Makes this app kinda useless..
Added input validation (just makes sure that something is entered)

Signed-off-by: moonboy13 <conlonkyle@gmail.com>
trying to get eclipse to push
Still trying to push
we
Still trouble shooting
Hopefully this works
Merge branch 'master' of https://github.com/moonboy13/Kerbal-Transfer-Calc

Necessary to fix pushing problems