add "Frequently Asked Questions" to README.md (#545)

README.md

@@ -56,6 +56,34 @@ This project and the maintainers of thousands of other packages are working with
 
 [Learn more](https://tidelift.com/subscription/pkg/pypi-comtypes?utm_source=pypi-comtypes&utm_medium=referral&utm_campaign=github).
 
+## Frequently Asked Questions
+
+### Q: Why does this package not support platforms other than Windows?
+**A:** [The Microsoft Component Object Model (COM)](https://learn.microsoft.com/en-us/windows/win32/com/com-technical-overview) is a technology that is unique to Windows and is not supported on other platforms.
+
+[The phrase _"COM is a platform-independent"_ in the MS documentation](https://learn.microsoft.com/en-us/windows/win32/com/component-object-model--com--portal) means that COM maintains compatibility across different versions of Windows, and does NOT imply that it is supported on Linux or Mac.
+
+As long as COM is not supported outside of Windows, this project does not plan to port to other platforms.
+
+### Q: Why does `cannot import name 'COMError' from '_ctypes'` error occur when using this package on platforms other than Windows?
+**A:** The [`_ctypes`](https://github.com/python/cpython/blob/main/Modules/_ctypes/_ctypes.c) is part of the internal implementation of the [`ctypes`](https://github.com/python/cpython/blob/main/Lib/ctypes/) standard library that exists for Python on all platforms.  
+However, `COMError` and COM-related features are implemented only in Python for Windows.
+
+In cross-platform software development, care must be taken to ensure that codebase dependent on `comtypes` does not execute in environments other than Windows.
+
+### Q: Despite a script that depends on `comtypes` having run successfully before, a error (`ImportError`, `NameError`, or `SyntaxError`) is raised now, and the same error occurs again and again.
+
+**A:** Executing `py -m comtypes.clear_cache` and then running the script again might resolve the problem.
+
+When `comtypes.client.GetModule` is called (either directly or indirectly), `comtypes` generates Python module files.  
+If Python is forced to terminate or crashes in the middle of file generation, the codebase written to the file becomes partial.  
+When Python tries to import this unexecutable partial codebase module, an error occurs.
+
+Executing `py -m comtypes.clear_cache` identifies the directories where the "cache module files" are stored and deletes them.  
+After deleting these partial modules and running the script again, `comtypes.client.GetModule` is called and executable modules are generated anew.
+
+However, if the script implementation does not use `comtypes.client.GetModule` or processes generated files, it may not be a solution.
+
 ## Documentation:
 
 The documentation is currently hosted on pythonhosted at: