Implement possibility to use one .md file as option for md baseliner

[Igmat]

It could be possible to write baseline in .spec.md file instead of separate one. Something like this:

sampleFn(1, 3) /// returns -> 5
sampleFn(1, null) /// throws -> NullPointerException

Or in next block like this: index.spec.js file:

sampleFn(1, 3)
sampleFn(1, null)

output:

5
null isn't assignable

[Igmat]

This feature requires #11 to be implemented.