Gherkin language support

Have you consider to support Gherkin language directly, similar to what https://github.com/behave/behave is doing for python? The idea to separate a "test" language from an implementation (C++/python/...) is a great one, I think. Because right now Catch2 projects tries to implement both with C++, and writing tests is not as easy as in Gherkin.

```
GIVEN Person "A" does not know "C++"
GIVEN Person "B" knows "C++"
WHEN Person "A" writes a "TEST"
WHEN Person "B" implements "TEST" in "C++"
THEN "TEST" should be ok

```