Add `killer-sudoku-helper` exercise · exercism/fsharp@e325447

Run tests: bin/build/practice/bottle-song/BottleSongTests.fs#L136

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/eliuds-eggs/EliudsEggsTests.fs#L22

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/knapsack/KnapsackTests.fs#L81

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/resistor-color-duo/ResistorColorDuoTests.fs#L35

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/resistor-color/ResistorColorTests.fs#L31

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/square-root/SquareRootTests.fs#L30

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/resistor-color-trio/ResistorColorTrioTests.fs#L59

Main module of program is empty: nothing will happen when it is run

Run tests: bin/build/practice/killer-sudoku-helper/KillerSudokuHelperTests.fs#L67

Main module of program is empty: nothing will happen when it is run

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