add CMake language specs; various quality-of-life improvements

[chronopoulos]

main fix: add languages to CMakeLists to prevent cmake errors "Cannot determine link language"

other quality-of-life improvements: static .gitignore, codified build/ directory in patternRunner (reflected in README), replaced hard-coded niter values with function variables. added dependencies, build and run instructions to README

[chronopoulos]

p.s. thanks for sharing this code! it works great and is fun to play with.