feat(solutions): add find-closest-number/python/function

challenges/find-closest-number/solutions/python/function/README.md

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+# find-closest-number/python/function
+
+Created by [@Divlo](https://github.com/Divlo) on 1 May 2022.

challenges/find-closest-number/solutions/python/function/solution.py

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+import sys
+
+
+def find_closest_number(integers: list[int], value: int) -> int:
+    """
+    From list of integers, get number closest to a given value
+    """
+    return min(integers, key=lambda x: abs(x - value))
+
+
+numbers: list[int] = []
+for value in sys.stdin:
+    numbers.append(int(value.rstrip('\n')))
+
+given_number = numbers[0]
+numbers = numbers[2:]
+print(find_closest_number(numbers, given_number))