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exercism fetch fsharp spiral-matrix

Given the size, return a square matrix of numbers in spiral order.

The matrix should be filled with natural numbers, starting from 1 in the top-left corner, increasing in an inward, clockwise spiral order, like these examples:

Spiral matrix of size 3
1
2
3
1 2 3
8 9 4
7 6 5
Spiral matrix of size 4
1
2
3
4
 1  2  3 4
12 13 14 5
11 16 15 6
10  9  8 7

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