Add sample code for Nuitka standalone executable tutorial

nuitka-standalone-executable/cpu_benchmark.py

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+import math
+import time
+
+start = time.perf_counter()
+total = 0.0
+for i in range(20_000_000):
+    total += math.sqrt(i)
+elapsed = time.perf_counter() - start
+
+print(f"Result: {total}")
+print(f"Time: {elapsed:.3f}s")

nuitka-standalone-executable/sample.txt

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+Python is a popular programming language. Python is easy to learn, and Python
+is also powerful enough for real projects. Many developers choose Python for
+web development, data science, and automation. Python code is often easy to
+read, which is one reason Python remains popular among beginners and
+experienced developers alike.

nuitka-standalone-executable/wordcount.py

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+from argparse import ArgumentParser
+from collections import Counter
+from pathlib import Path
+
+parser = ArgumentParser(description="Show the most common words in a text file.")
+parser.add_argument("file", type=Path)
+parser.add_argument("-n", "--top", type=int, default=5)
+args = parser.parse_args()
+
+words = args.file.read_text(encoding="utf-8").lower().split()
+for word, count in Counter(words).most_common(args.top):
+    print(f"{word}: {count}")