Implement volume calculation for ellipsoid

src/main/java/com/thealgorithms/maths/Volume.java

@@ -125,4 +125,16 @@ public static double volumeFrustumOfPyramid(double upperBaseArea, double lowerBa
     public static double volumeTorus(double majorRadius, double minorRadius) {
         return 2 * Math.PI * Math.PI * majorRadius * minorRadius * minorRadius;
     }
+
+    /**
+     * Calculate the volume of an ellipsoid.
+     *
+     * @param a first semi-axis of an ellipsoid
+     * @param b second semi-axis of an ellipsoid
+     * @param c third semi-axis of an ellipsoid
+     * @return volume of the ellipsoid
+     */
+    public static double volumeEllipsoid(double a, double b, double c) {
+        return (4 * Math.PI * a * b * c) / 3;
+    }
 }

src/test/java/com/thealgorithms/maths/VolumeTest.java

@@ -41,5 +41,8 @@ public void volume() {
 
         /* test torus */
         assertEquals(39.47841760435743, Volume.volumeTorus(2, 1));
+
+        /* test ellipsoid */
+        assertEquals(25.1327412287183459, Volume.volumeEllipsoid(3, 2, 1));
     }
 }