Update and rename test_file to leapyear.war

leapyear.war

@@ -0,0 +1,21 @@
+public class Main {
+
+  public static void main(String[] args) {
+
+    // year to be checked
+    int year = 1900;
+    boolean leap = false;
+
+    // if the year is divided by 4
+    if (year % 4 == 0) {
+
+      // if the year is century
+      if (year % 100 == 0) {
+
+        // if year is divided by 400
+        // then it is a leap year
+        if (year % 400 == 0)
+          leap = true;
+        else
+          leap = false;
+      }