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Added class that calculated Pi (TheAlgorithms#2324)

* added class PiNilakantha.java which calculates Pi using Nilakanthas infinite series * added link to explanation partially fixes TheAlgorithms#2323

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Maths
- PiNilakantha.java

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`‎Maths/PiNilakantha.java`

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	`1`	`+package Maths;`
	`2`	`+`
	`3`	`+public class PiNilakantha {`
	`4`	`+`
	`5`	`+ // Calculates Pi using Nilakantha's infinite series`
	`6`	`+ // Method 2 in the following link explains the algorithm`
	`7`	`+ //https://en.scratch-wiki.info/wiki/Calculating_Pi`
	`8`	`+`
	`9`	`+`
	`10`	`+ public static void main(String[] args) {`
	`11`	`+ assert calculatePi(0) == 3.0;`
	`12`	`+ assert calculatePi(10) > 3.0;`
	`13`	`+ assert calculatePi(100) < 4.0;`
	`14`	`+`
	`15`	`+ System.out.println(calculatePi(500));`
	`16`	`+ }`
	`17`	`+`
	`18`	`+`
	`19`	`+ /**`
	`20`	`+ *`
	`21`	`+ * @param iterations number of times the infinite series gets repeated`
	`22`	`+ * Pi get more accurate the higher the value of iterations is`
	`23`	`+ * Values from 0 up to 500 are allowed since double precision is not sufficient`
	`24`	`+ * for more than about 500 repetitions of this algorithm`
	`25`	`+ * @return the pi value of the calculation with a precision of x iteration`
	`26`	`+ */`
	`27`	`+ public static double calculatePi(int iterations) {`
	`28`	`+ if (iterations < 0 \|\| iterations > 500) {`
	`29`	`+ throw new IllegalArgumentException("Please input Integer Number between 0 and 500");`
	`30`	`+ }`
	`31`	`+`
	`32`	`+ double pi = 3;`
	`33`	`+ int divCounter = 2;`
	`34`	`+`
	`35`	`+ for (int i = 0; i < iterations; i++) {`
	`36`	`+`
	`37`	`+ if (i % 2 == 0)`
	`38`	`+ pi = pi + 4.0 / (divCounter * (divCounter + 1) * (divCounter + 2));`
	`39`	`+ else`
	`40`	`+ pi = pi - 4.0 / (divCounter * (divCounter + 1) * (divCounter + 2));`
	`41`	`+`
	`42`	`+ divCounter += 2;`
	`43`	`+ }`
	`44`	`+ return pi;`
	`45`	`+ }`
	`46`	`+}`

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`‎Maths/PiNilakantha.java`

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