Fix problems on blessthismess branch

See merge request !5

# Conflicts:
#   score.hpp

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https://pixabay.com/get/g2a748711d31edac04ac39447ab48c791c6e2c4c2dc2f7e30dbb5b86eab3ea8529dc2a1e76642cf8f6ec861090973b93253c9f7fad1f5c3af66f0388a5872f259b404c9710d953f14f85216d510fedf2f_1920.jpg
various improvemennnts

non-numeric input check added

See merge request !3

# Conflicts:
#   main.cc

Merge gamedev with License to main

See merge request !4

Add image to readme

See merge request !2

add highscore into the game

See merge request !1