Add reusable CLAUDE.md template

CLAUDE.md

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+> A reusable template for defining project context and expectations when using Claude Code.
+
+
+# CLAUDE.md
+
+## Project Overview
+This project exists to:
+- Briefly describe what the project does
+- Define the primary goal of the codebase
+- Clarify the intended users or use cases
+
+Keep this section short but explicit. Claude uses this as the mental model for all decisions.
+
+---
+
+## Tech Stack
+- Language(s):
+- Frameworks / Libraries:
+- Runtime / Platform:
+- Database / Storage:
+- Tooling (build, lint, test, CI):
+
+---
+
+## Project Structure
+High-level explanation of the repository layout.
+
+Example:
+- `/src` – Core application logic
+- `/tests` – Unit and integration tests
+- `/docs` – Project documentation
+- `/scripts` – Automation and tooling scripts
+
+---
+
+## Coding Standards & Conventions
+Claude should follow these rules when writing or modifying code:
+
+- Preferred coding style (functional, OOP, etc.)
+- Naming conventions
+- Error handling approach
+- Formatting or linting rules
+- Patterns to prefer or avoid
+
+If unsure, prioritize clarity and maintainability.
+
+---
+
+## Testing Philosophy
+- Types of tests used (unit, integration, e2e)
+- Testing framework(s)
+- How new code should be tested
+- When tests are optional vs mandatory
+
+Claude should not skip tests unless explicitly instructed.
+
+---
+
+## Performance, Security & Reliability
+Important non-functional requirements:
+
+- Performance constraints
+- Security considerations
+- Data validation rules
+- Logging and observability expectations
+
+---
+
+## How Claude Should Help
+Explicit instructions for Claude Code behavior:
+
+- Act as a senior engineer reviewing and improving code
+- Ask clarifying questions when requirements are ambiguous
+- Prefer minimal, incremental changes
+- Explain reasoning when making non-obvious decisions
+- Flag potential risks, edge cases, or technical debt
+
+---
+
+## How Claude Should NOT Help
+Boundaries to avoid unhelpful output:
+
+- Do not introduce unnecessary abstractions
+- Do not rewrite large sections without justification
+- Do not assume missing requirements
+- Do not change public APIs unless requested
+
+---
+
+## Common Workflows
+Typical tasks Claude will assist with:
+
+- Code reviews
+- Refactoring
+- Bug fixing
+- Writing tests
+- Explaining existing code
+- Generating documentation
+
+Describe any preferred workflow steps if applicable.
+
+---
+
+## Context Sharing Guidelines
+When context is large:
+
+- Focus on the most relevant files
+- Summarize rather than paste entire directories
+- Ask Claude to confirm understanding before proceeding
+
+---
+
+## Notes for Future Contributors
+Anything a new contributor (human or AI) should know:
+
+- Known pain points
+- Legacy decisions
+- Upcoming refactors
+- Things that commonly go wrong
+
+---
+
+## Final Instruction
+If there is ever a conflict between being fast and being correct,
+**prioritize correctness, clarity, and maintainability.**
+
+Add reusable CLAUDE.md template for Claude Code projects
+Provides a structured template to clearly define project context, coding standards, and expectations for Claude Code.