Add double byte string format

ReadMe.md

@@ -20,7 +20,7 @@ This is a pip package that can be installed into any project and covers the foll
 - logging_handling: extend log and also error message handling
 - requests_handling: requests wrapper for better calls with auth headers
 - script_handling: pid lock file handling, abort timer
-- string_handling: byte format, datetime format, hashing, string formats for numbrers, etc
+- string_handling: byte format, datetime format, hashing, string formats for numbrers, double byte string format, etc
 
 ## How to publish
 
@@ -41,7 +41,7 @@ uv publish --index egra-gitea --token <gitea token> --native-tls
 
 ## Test package
 
-We must set the full index URL here because we run with "--no-project2
+We must set the full index URL here because we run with "--no-project"
 
 ```sh
 uv run --with corelibs --index egra-gitea=https://git.egplusww.jp/api/packages/PyPI/pypi/simple/ --no-project --native-tls -- python -c "import corelibs"
@@ -51,12 +51,16 @@ uv run --with corelibs --index egra-gitea=https://git.egplusww.jp/api/packages/P
 
 In the test folder other tests are located.
 
-At the moment only a small test for the "progress" module is set
+At the moment only a small test for the "progress" and the "double byte string format" module is set
 
 ```sh
 uv run --native-tls tests/progress/progress_test.py
 ```
 
+```sh
+uv run --native-tls tests/double_byte_string_format/double_byte_string_format.py
+```
+
 ## How to install in another project
 
 This will also add the index entry