test: make 100 coverage adding missing cases

docs: expand README with comprehensive overview, features, examples a…

…nd comparison with native Go

feat: add IfF and IfV

feat: add ConvertFromMap and ConvertToMap

build: update version to 1.19

feat(recover): add new methods to recover panics

feat: add IsFound

feat: add CheckSlice, CheckSliceSingle, CheckMap, CheckMapSingle

feat: add CopyMap

ci: add github actions