add most frequent snippet

snippets/most_frequent.md

@@ -0,0 +1,19 @@
+---
+title: most_frequent
+tags: array,beginner
+---
+
+Method return the most frequent element that appears in a `list`.
+
+Upon calling the function, in return you a `value`, which most frequently appears in the `list`.
+
+```py
+def most_frequent(list):
+    return max(set(list), key = list.count)
+```
+
+```py
+numbers = [1,2,1,2,3,2,1,4,2]
+most_frequent(numbers) #2
+```
+