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[java/rational-numbers] Create mentoring.md #2207

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[java/rational-numbers] Create mentoring.md #2207

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11 changes: 11 additions & 0 deletions tracks/java/exercises/rational-numbers/mentoring.md
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The tolerance (DOUBLE_EQUALITY_TOLERANCE) is too small for the unit test testRaiseARealNumberToAPositiveRationalNumber().
The calculation of exp() is too numerically sensitive to whether the user implements
```
Math.pow(Math.pow(x, numerator), 1.0/denominator)
```
or
```
Math.pow(Math.pow(x, 1.0/denominator), numerator)
```
Both are mathematically equivalent, however, the first one fails the unit test whereas the second passes.
Furthermore, the instructions to the exercise bias the user towards the first implementation.