Add word-search exercise

[behrtam]

I don't really like the example solution, but it works. Also I'm not sure if it is the right way to provide the class Point this way.

https://github.com/exercism/x-common/blob/master/exercises/word-search/description.md

[arcuru]

I like providing the Point class. It could've been done with just having them return the coords as a tuple, but this way is more explicit.

LGTM 👍

[pheanex]

Hey @behrtam, I've got two questions on this:

• Since in Skeleton files should be included in all problems to make it easier #272 you were quite in favor of very minimal skeleton files, why did you provide such a (huge) skeleton file here?
• Aren't we limiting the user by forcing the class-structure? (I do not see yet the added value of the "Point" class/general class structure)

[behrtam]

Well it's four months away, but I assume I did it that way because the test suit relies on the class Point. This is probably a unpleasant result of my example implementation which I normally write first.

Maybe if we would instead test with tuples that represent a point, we would not need a dedicated class for that, which also means we could reduce the skeleton file and the people solving this problem would have more freedom.

[pheanex]

Ah ok that makes sense, thank you.
If its okay with you, I'll try to refactor it a bit and send a PR 😄

[pheanex]

Okay i created PR #420, please review.
Please note: I also changed the order of point tuples from coordinate-based (x,y) to a (at least to my mind) more intuitive (row,colum) notation. (If you prefer the coordinate-system, i'll update it).