Add Perimeter Calculation Algorithms (#3247)

Co-authored-by: Andrii Siriak <siryaka@gmail.com>

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

@@ -0,0 +1,37 @@
+package com.thealgorithms.maths;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+public class perimeterTest {
+
+    //Perimeter of polygon
+    @Test
+    void testcase1(){
+        Assertions.assertEquals(20.0,Perimeter.perimeter_polygon(4,5));
+    }
+    @Test
+    void testcase2(){
+        Assertions.assertEquals(30.0,Perimeter.perimeter_polygon(5,6));
+    }
+
+    //Perimeter of Rectangle
+    @Test
+    void testcase3(){
+        Assertions.assertEquals(18.0,Perimeter.perimeter_rectangle(4,5));
+    }
+    @Test
+    void testcase4(){
+        Assertions.assertEquals(14.0,Perimeter.perimeter_rectangle(4,3));
+    }
+
+    //Circumference of a circle
+    @Test
+    void testcase5(){
+        Assertions.assertEquals(31.41592653589793,Perimeter.circumference(5));
+    }
+    @Test
+    void testcase6(){
+        Assertions.assertEquals(43.982297150257104,Perimeter.circumference(7));
+    }
+}