Add an Agents.md and ignore the old venv

.gitignore

@@ -12,3 +12,6 @@ coverage.xml
 /.eggs/
 .vscode
 /.venv/
+
+# Ignore old venv location
+/env/

Agents.md

@@ -0,0 +1,67 @@
+
+# HL7 library for Python
+
+## Project Overview
+
+This is a standalone library for parsing HL7 v2.x messages, supporting the maintained versions of Python.
+
+## Tech Stack
+
+- **Testing**: Python unittest
+- **Package Manager**: uv
+
+
+## Project Structure
+
+```
+hl7/
+tests/
+docs/
+```
+
+## Development Guidelines
+
+### Key Principles
+
+## Environment Setup
+
+### Installation Steps
+
+```bash
+# Run uv sync
+make init
+```
+
+## Security Considerations
+
+- Avoid introducing security issues.
+
+## Testing Strategy
+
+We aim for a high level of test coverage, primarily through unit tests.
+
+- Occasionally we will use unittest.mock for things that may be otherwise hard to. When patching, prefer to use `autospec=True`
+- Whenever you fix a bug, try to add a test case that documents the broken behavior is no longer happening.
+- Additionally, we run our sphinx documentation through doctest, not to increase coverage, but to ensure the documentation accurately matches.
+
+To run the test suite (will run tox for all supported Python versions as well as the doctests):
+
+```bash
+make tests
+```
+
+## Programmatic Checks for OpenAI Codex
+
+To run ruff linting:
+
+```bash
+make lint
+```
+
+## Reference Resources
+
+- [HL7 Definitions](https://hl7-definition.caristix.com/v2/)
+
+## Changelog
+
+

Makefile

@@ -41,6 +41,8 @@ clean: clean-docs
 	rm -rf *.egg-info .mypy_cache coverage.xml .venv
 	find . -name "*.pyc" -type f -delete
 	find . -type d -empty -delete
+	# Legacy venv (remove eventually)
+	rm -rf env
 .PHONY: clean-python