Adding Java solutions for new Easy and Moderate challenges.

Adding Java solution for:
Easy
- DataRecovery
- EvenNumbers
- FibonacciSeries
- FileSize
- LowercaseText
- LowestUniqueNumber
- MultiplesOfNumber
- MultiplicationTables
- OddNumbers
- ReverseWords
- SumOfInts
- SumOfPrimes
- SwapElements
Moderate
- FindASquare
- PrimeNumbers
- RemoveCharacters