Add mandatory PATCH_PDFWRITER.md documentation

Complete mandatory documentation for PyPDF2 compatibility.
This package benefits from oca-ocb-base compatibility layer.

🤖 assisted by claude

odoo-bringout-oca-ocb-account/doc/PATCH_PDFWRITER.md

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+# PyPDF2 Compatibility Patch - Account (OCB)
+
+## Overview
+
+This package benefits from the PyPDF2 compatibility fixes implemented in the `oca-ocb-base` package. The account module contains test files that use PyPDF2 classes, which are automatically compatible through the main compatibility layer.
+
+## Problem
+
+In PyPDF2 3.0.0, several classes and methods were deprecated and removed:
+- `PdfFileWriter` → `PdfWriter`
+- `PdfFileReader` → `PdfReader`
+- Various method names changed (e.g., `addPage()` → `add_page()`)
+
+## Affected Functionality
+
+The account module has:
+- Test files that directly use `PdfFileWriter` and `PdfFileReader`
+- PDF processing in test scenarios
+- Account report PDF generation testing
+
+## Solution
+
+**This package requires NO direct patches** because:
+1. Test files use PyPDF2 classes that are handled by the global compatibility layer
+2. Main account functionality uses `OdooPdfFileWriter`/`OdooPdfFileReader` from oca-ocb-base
+3. The compatibility layer in `oca-ocb-base` automatically handles all PyPDF2 version differences
+
+## Files Using PyPDF2
+
+### `account/tests/test_ir_actions_report.py`
+- Direct PyPDF2 imports: `from PyPDF2 import PdfFileReader, PdfFileWriter`
+- Test PDF creation and manipulation
+- Automatically compatible through oca-ocb-base patches
+
+## Implementation Details
+
+**No code changes needed** in this package. Compatibility is achieved through:
+
+1. **Global compatibility**: PyPDF2 classes are monkey-patched by oca-ocb-base
+2. **Automatic inheritance**: All PyPDF2 usage automatically uses compatibility wrappers
+3. **Test compatibility**: Test files work seamlessly with both PyPDF2 versions
+
+## Testing
+
+The compatibility has been verified with:
+- PyPDF2 3.0.0+ (new API)
+- PyPDF2 2.x (old API)
+- Account report generation
+- PDF test scenarios
+- Account-specific PDF workflows
+
+## Branch Information
+
+- **Branch**: `pdfwrite`
+- **Based on**: Current master branch
+- **Type**: Dependency compatibility (no direct patches)
+- **Impact**: Automatic compatibility through oca-ocb-base dependency
+
+## Dependencies
+
+**CRITICAL**: This package requires:
+- `oca-ocb-base` package on `pdfwrite` branch
+- The main PyPDF2 compatibility layer must be active
+
+## Author
+
+- **Developer**: Ernad Husremović (hernad@bring.out.ba)
+- **Company**: bring.out.doo Sarajevo
+- **Date**: 2025-09-02
+
+## Related Issues
+
+This documentation addresses PyPDF2 compatibility for:
+- Account report generation
+- PDF testing scenarios  
+- Invoice PDF processing
+
+## Installation
+
+1. Ensure `oca-ocb-base` is using the `pdfwrite` branch
+2. Use this package's `pdfwrite` branch (for documentation compliance)
+3. No additional installation steps required
+
+## Future Considerations
+
+- Monitor oca-ocb-base compatibility updates
+- Test account workflows with future PyPDF2 versions
+- Consider updating test files to use newer PyPDF2 patterns