Create a testing folder with CMake configuration

[gardusig]

Add a testing folder to be used as a template for future competitions

[gardusig]

CPP interesting flags to validate its usefulness:

• -fno-omit-frame-pointer
• -fsanitize=address,undefined
• -g
• -O3
• -std=c++17
• -Wall
• -Wl,-stack_size -Wl,10000000
• -Wno-char-subscripts
• -Wno-sign-compare
• -Wno-unused-result
• -Wshadow

[gardusig]

21 #18