Added armstrong number implementation in java and Readme for Armstrong

Armstrong.java

@@ -0,0 +1,37 @@
+
+import java.util.Scanner;
+
+public class Armstrong {
+
+	public void checkForArmstrong(int n)
+	{
+		int n2=n;
+		int sum=0;
+		while(n>0)
+		{
+			int n1=n%10;
+			n1=n1*n1*n1;
+			sum+=n1;
+			n=n/10;
+		}
+
+		if(sum==n2)
+		{
+			System.out.println("Its an Armstrong number");
+		}
+		else
+		{
+			System.out.println("Not an Armstrong number");
+		}
+	}
+
+	public static void main(String args[])
+	{
+		Armstrong obj=new Armstrong();
+		System.out.println("Enter a number to be checked");
+		Scanner scan = new Scanner(System.in);
+		int n=scan.nextInt();
+		obj.checkForArmstrong(n);
+	}
+
+}

Armstrong.md

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+An Armstrong number is a number in which the actual number is equal to the sum of cubes of individual digits of the number:
+
+Example:
+153
+1*1*1=1
+
+5*5*5=125
+
+3*3*3=27
+
+1+125+27=153