feat(challenges): add rotate-2-dimensional-array-90-degrees

challenges/rotate-2-dimensional-array-90-degrees/README.md

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+# rotate-2-dimensional-array-90-degrees
+
+Created by [@Divlo](https://github.com/Divlo) on 3 December 2021.
+
+## Instructions
+
+Given a square/rectangle matrix representing an image and a direction of rotation (`clockwise` or `anticlockwise`), rotate the image by 90 degrees.
+
+### Input
+
+- **Line 1:** The direction (`clockwise` or `anticlockwise`) of rotation
+- **Next Lines:** The matrix of the image
+
+### Output
+
+- **Lines:** The rotated matrix
+
+## Examples
+
+### Example 1
+
+#### Input
+
+```txt
+clockwise
+1 2 3
+4 5 6
+7 8 9
+```
+
+#### Output
+
+```txt
+7 4 1
+8 5 2
+9 6 3
+```
+
+### Example 2
+
+#### Input
+
+```txt
+anticlockwise
+1 2 3
+4 5 6
+7 8 9
+```
+
+#### Output
+
+```txt
+1 4 7
+2 5 8
+3 6 9
+```
+
+See the `test` folder for examples of input/output.

challenges/rotate-2-dimensional-array-90-degrees/test/1/input.txt

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+clockwise
+1 2 3
+4 5 6
+7 8 9

challenges/rotate-2-dimensional-array-90-degrees/test/1/output.txt

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+7 4 1
+8 5 2
+9 6 3

challenges/rotate-2-dimensional-array-90-degrees/test/2/input.txt

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+anticlockwise
+1 2 3
+4 5 6
+7 8 9

challenges/rotate-2-dimensional-array-90-degrees/test/2/output.txt

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+1 4 7
+2 5 8
+3 6 9

challenges/rotate-2-dimensional-array-90-degrees/test/3/input.txt

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+clockwise
+5 1 9 11
+2 4 8 10
+13 3 6 7
+15 14 12 16

challenges/rotate-2-dimensional-array-90-degrees/test/3/output.txt

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+15 13 2 5
+14 3 4 1
+12 6 8 9
+16 7 10 11

challenges/rotate-2-dimensional-array-90-degrees/test/4/input.txt

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+clockwise
+11 12 13 14
+21 22 23 24
+31 32 33 34

challenges/rotate-2-dimensional-array-90-degrees/test/4/output.txt

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+31 21 11
+32 22 12
+33 23 13
+34 24 14