Add clamp_number snippet

snippets/clamp_number.md

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+---
+title: clamp_number
+tags: math,beginner
+---
+
+Clamps `num` within the inclusive range specified by the boundary values `a` and `b`.
+
+If `num` falls within the range, return `num`. 
+Otherwise, return the nearest number in the range.
+
+```py
+def clamp_number(num,a,b):
+  return max(min(num, max(a,b)),min(a,b))
+```
+
+```py
+clamp_number(2, 3, 5) # 3
+clamp_number(1, -1, -5) # -1
+```