New practice exercise connect

[depial]

This is the practice exercise connect taken from problem-specifications with scaffolding created by configlet.

Possibly relevant points for reviewers to consider:

• Difficulty has been set at 5 (Medium) due to use of a basic graph traversal algorithm in example.jl.
• The name of the function tested is connect.
• Verbose unit testing implemented
• There is one extra edge case added to the tests: a 1x1 empty board, [ "." ], meant to complement the 1x1 full boards, [ "X" ] and [ "O" ]. Nothing was added to tests.toml in regard to this.

There are further possible edge cases related to the added one above, such as:

• 0x0 board: [ "" ]
• 1xn board, 0 wins: [ ". . . O . X . ." ]
• 1xn board, X wins: [ "X X X X" ]
• And nx1 variations...

These are mostly to prevent the use of length checks , but the already added edge case above probably does enough to discourage that (e.g. isone(length(board)) && return first(board) no longer works). Otherwise, testing seems to be sufficient to check for correctness, but a couple more tests could be added to provide more symmetry. For example, more O wins could be added since, of the 11 original tests, there are only two O wins, and one of those is an edge case.

[depial]

If there is anyone @exercism/reviewers who would be interested in working with me to review some practice exercises to add to the track, please let me know.

[depial]

I've added my name to config.json, but I would rather prefer it be left off if possible.

Edit: reverted to an empty field for author's name, since adding mine is not necessary.

You can leave it off if you want. You just won’t get the additional rep points on Exercism for authoring the exercise (30 I believe). You’d only get rep for opening this PR.