Add a challenge for Unpack, closed #58

Author: laike9m

challenges/intermediate-unpack/hints.md

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+- Finish typed-dict challenges first
+- Check out [Unpack](https://docs.python.org/3/library/typing.html#typing.Unpack)

challenges/intermediate-unpack/question.py

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+"""
+TODO:
+
+`foo` expects two keyword arguments - `name` of type `str`, and `age` of type `int`.
+"""
+
+from typing import TypedDict
+
+
+class Person(TypedDict):
+    name: str
+    age: int
+
+
+def foo(**kwargs):
+    ...
+
+
+## End of your code ##
+person: Person = {"name": "The Meaning of Life", "age": 1983}
+foo(**person)
+foo(**{"name": "Brian", "age": 30})
+
+foo(**{"name": "Brian"})  # expect-type-error
+person2: dict[str, object] = {"name": "Brian", "age": 20}
+foo(**person2)  # expect-type-error
+foo(**{"name": "Brian", "age": "1979"})  # expect-type-error

challenges/intermediate-unpack/solution.py

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+"""
+TODO:
+
+`foo` expects two keyword arguments - `name` of type `str`, and `age` of type `int`.
+"""
+
+from typing import Unpack, TypedDict
+
+
+class Person(TypedDict):
+    name: str
+    age: int
+
+
+def foo(**kwargs: Unpack[Person]):
+    ...
+
+
+## End of your code ##
+person: Person = {"name": "The Meaning of Life", "age": 1983}
+foo(**person)
+foo(**{"name": "Brian", "age": 30})
+
+foo(**{"name": "Brian"})  # expect-type-error
+person2: dict[str, object] = {"name": "Brian", "age": 20}
+foo(**person2)  # expect-type-error
+foo(**{"name": "Brian", "age": "1979"})  # expect-type-error