[project] Add steps to debug and fix unicode errors

As one of the discussions in the forum has shown, the recommendation doesn't always work on some systems. So adding instructions how to verify the solution and how to manually open files in Unicode mode.

project/README.md

@@ -16,4 +16,16 @@ export LANG=en_US.UTF-8
 export LANGUAGE=en_US.UTF-8
 ```
 
+To verify the effect, you can run the following command end check that it outputs 'utf-8'
+```python
+> python -c 'import locale; print(locale.getpreferredencoding())'
+utf-8
+```
+
 You can find more details in this [article](https://perlgeek.de/en/article/set-up-a-clean-utf8-environment).
+
+If this doesn't work, you can explicitly specify the encoding when opening files:
+```python
+with open(filename, 'r', encoding="utf-8") as file:
+  ...
+```