Merge branch 'feature/shde-substract-function' into 'main'

.gitlab-ci.yml

...-numbers-solution/substract-numbers-cli/NumberCruncher.cs

substract-numbers-solution/substract-numbers-cli/Program.cs

...t-numbers-solution/substract-numbers-cli/substract.csproj

substract-numbers-solution/substract-numbers-solution.sln

...-solution/substract-numbers-tests/SubstractNumbersTest.cs

...-solution/substract-numbers-tests/run-acceptance-tests.sh

...on/substract-numbers-tests/substract-numbers-tests.csproj