adds test to bound variable for roll

method roll tests for argument type and values set between [0-10].
correct the tests for roll
merge roll-accept-only-a-bounded-int

+style
set test for two rolls
add a score var
merge feature/player-roll-twice

add score
check if 2 rolls can score more than 10
correct the test for two rolls
merge two-rolls-are-bounded-too
set test for two frames
add missing part of the assertion
answer to test and postpone the unavoidable
merge feature/manage-two-frames