Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to Godocx
+
+We welcome bug reports, feature requests, and pull requests.
+Please follow these guidelines to keep things organized.
+
+## Reporting Issues
+- Search existing issues before opening a new one.
+- Provide a clear description of the problem.
+- Include Go version, OS, and relevant code snippets.
+
+## Requesting Features
+- Open a GitHub issue labeled `feature`.
+- Describe the use case and, if possible, share a sample DOCX.
+
+## OOXML Standards Reference
+
+Godocx operates on DOCX files that conform to the **Office Open XML (OOXML)** standard.
+
+**All contributors should consult these resources** when implementing or reviewing features, to ensure the generated XML is valid and compatible.
+
+- **Official Standard:**  
+  [ECMA-376 Office Open XML File Formats](https://www.ecma-international.org/publications-and-standards/standards/ecma-376/)  
+  The authoritative specification for OOXML, including packaging, markup, and compatibility details.
+
+- **Quick Schema Lookup:**  
+  [Datypic OOXML Schema Reference](https://www.datypic.com/sc/ooxml/)  
+  An informal, browsable view of OOXML `.xsd` schemas and elements, useful for quick tag and attribute lookups.
+
+- **Developer Tool:**  
+  [OOXML Validator for VS Code](https://marketplace.visualstudio.com/items?itemName=mikeebowen.ooxml-validator-vscode)  
+  A VS Code extension that validates OOXML documents against the schema, helping catch errors early during development.