Add bifurcate snippet

snippets/bifurcate.md

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+---
+title: bifurcate
+tags: list,intermediate
+---
+
+Splits values into two groups. 
+If an element in `filter` is `True`, the corresponding element in the collection belongs to the first group; otherwise, it belongs to the second group.
+
+Use list comprehension and `enumerate()` to add elements to groups, based on `filter`.
+
+```py
+def bifurcate(lst, filter):
+  return [
+    [x for i,x in enumerate(lst) if filter[i] == True],
+    [x for i,x in enumerate(lst) if filter[i] == False]
+  ]
+```
+
+```py
+bifurcate(['beep', 'boop', 'foo', 'bar'], [True, True, False, True]) # [ ['beep', 'boop', 'bar'], ['foo'] ]
+```