Add is_divisible snippet

snippets/is_divisible.md

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+---
+title: is_divisible
+tags: math,beginner
+---
+
+Checks if the first numeric argument is divisible by the second one.
+
+Use the modulo operator (`%`) to check if the remainder is equal to `0`.
+
+```py
+def is_divisible(dividend, divisor):
+  return dividend % divisor == 0
+```
+
+```py
+is_divisible(6, 3) # True
+```