Feat: improvement to create file tool (#797)

# Motivation

<!-- Why is this change necessary? -->

# Content

<!-- Please include a summary of the change -->

# Testing

<!-- How was the change tested? -->

# Please check the following before marking your PR as ready for review

- [x] I have added tests for my changes
- [x] I have updated the documentation or added new documentation as
needed

Author: kopekC

src/codegen/extensions/tools/create_file.py

@@ -37,7 +37,7 @@ def create_file(codebase: Codebase, filepath: str, content: str = "") -> CreateF
     if codebase.has_file(filepath):
         return CreateFileObservation(
             status="error",
-            error=f"File already exists: {filepath}",
+            error=f"File already exists: {filepath}, please use view_file to see the file content or realace_edit to edit it directly",
             filepath=filepath,
             file_info=ViewFileObservation(
                 status="error",