Added the code of Gregorian Calendar

Author: Coder98321

Gregorian_Calendar.py

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+# An extra day is added to the calendar almost every four years as February 29, and the day is called a leap day. It corrects the calendar for the fact that our planet takes approximately 365.25 days to orbit the sun. A leap year contains a leap day.
+
+# In the Gregorian calendar, three conditions are used to identify leap years:
+
+# The year can be evenly divided by 4, is a leap year, unless:
+# The year can be evenly divided by 100, it is NOT a leap year, unless:
+# The year is also evenly divisible by 400. Then it is a leap year.
+# This means that in the Gregorian calendar, the years 2000 and 2400 are leap years, while 1800, 1900, 2100, 2200, 2300 and 2500 are NOT leap years.
+
+def is_leap(year):
+    leap = False
+    if (year%4 == 0):
+        leap = True
+        if (year%100 == 0):
+            leap = False
+            if (year%400 == 0):
+                leap = True
+    return leap
+
+year = int(input("Enter the year here: "))
+print(is_leap(year))
+
+# If the given year is a leap year it outputs True else False