Add materials for the indent tutorial

Author: acsany

how-to-indent-in-python/README.md

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+# How to Properly Indent Python Code
+
+This folder contains sample code for the Real Python tutorial [How to Properly Indent Python Code](https://realpython.com/how-to-indent-in-python/).

how-to-indent-in-python/lucky_number.py

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+lucky_number = 7
+for number in range(10):
+    if number == lucky_number:
+        print("Found the lucky number!")
+    else:
+        print(f"{number} is not my lucky number.")
+
+print("Done.")