Add in_range snippet

snippets/in_range.md

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+---
+title: in_range
+tags: math,beginner
+---
+
+Checks if the given number falls within the given range.
+
+Use arithmetic comparison to check if the given number is in the specified range.
+If the second parameter, `end`, is not specified, the range is considered to be from `0` to `start`.
+
+```py
+def in_range(n, start, end = 0):
+  if (start > end):
+    end, start = start, end
+  return start <= n <= end
+```
+
+```py
+in_range(3, 2, 5); # True
+in_range(3, 4); # True
+in_range(2, 3, 5); # False
+in_range(3, 2); # False
+```