Update README with project overview

README.md

@@ -1,4 +1,88 @@
-# sysmlv2_dls
-Fundamental design language generators for SysML v2
+# sysmlv2_geometry
 
-pip install syside-license syside --index-url https://gitlab.com/api/v4/projects/69960816/packages/pypi/simple --upgrade
+## Overview
+`sysmlv2_geometry` provides a public, Python-based interface for building and
+sharing geometry information that can be consumed by SysML v2 tooling. The
+project currently focuses on two complementary capabilities:
+
+1. A generic, CAD-agnostic representation of assemblies that captures
+   translation, rotation, and ownership relationships between components.
+2. A concrete connector that reads assembly data from Onshape and converts it
+   into the common representation.
+
+The intent is to grow this repository into a hub for multiple CAD and digital
+engineering tools so that they can all feed geometry into SysML v2 models
+through a single, consistent API.
+
+## Key capabilities
+- **Generic assembly structure** – The `geometry_api` package exposes endpoints
+  for creating components, nesting them, and exporting the resulting hierarchy
+  as SysML v2 textual notation. This makes it possible to describe assemblies
+  even when the original CAD system is not available.
+- **Onshape connector** – The `onshape_connector` package authenticates with the
+  Onshape public API, walks assembly occurrences, and maps part poses into the
+  generic structure. This is the first CAD integration, with more connectors
+  planned.
+- **Transformation utilities** – The `transformation_api` package bundles
+  Christoph Gohlke's `transformations.py` helpers, which are used for converting
+  between transformation matrices, Euler angles, and other pose formats.
+
+## Repository layout
+```
+.
+├── build/                  # Packaging or temporary build artifacts
+├── examples/               # Sample data (e.g., SysML exports)
+├── src/
+│   ├── geometry_api/       # Public API for component creation & export
+│   ├── onshape_connector/  # Helpers for pulling assemblies from Onshape
+│   └── transformation_api/ # Math utilities for poses and transforms
+├── tests/                  # Pytest suite covering API & connectors
+├── requirements*.txt       # Runtime and CI dependency pins
+└── pyproject.toml          # Project metadata (package name, deps, etc.)
+```
+
+## Installation
+The project targets Python 3.8+ and is published under the package name
+`geometry-api`. To install the package locally:
+
+```bash
+python -m venv .venv
+source .venv/bin/activate
+pip install --upgrade pip
+pip install -e .
+```
+
+The base dependencies include `astropy` for Cartesian representations and
+`numpy` for matrix math. Some optional modules (for example, `syside` or the
+Onshape client) may be required depending on which connectors you use.
+
+## Configuring the Onshape connector
+To access a workspace hosted on Onshape you will need an API key pair. The
+connector searches for credentials in the `ACCESS_KEY` and `SECRET_KEY`
+environment variables or inside a `.env` file placed either next to the module
+or anywhere up the current working directory hierarchy. Once the credentials are
+available, you can call the helper utilities in `onshape_connector` to
+retrieve assembly instances, their hierarchical paths, and the transforms that
+locate each component.
+
+## Testing
+The repository uses `pytest`. After installing the project along with the
+additional requirements listed in `requirements.txt`, run:
+
+```bash
+pytest
+```
+
+Several tests rely on sample SysML outputs and mocked Onshape data to exercise
+export and transformation logic.
+
+## Roadmap
+This repository is intended to evolve into a broad geometry interface. Planned
+improvements include:
+
+- Additional CAD connectors beyond Onshape.
+- Richer metadata for components (materials, display properties, etc.).
+- Higher-level orchestration scripts and examples for end-to-end workflows.
+
+Contributions that add new tool integrations or extend the generic assembly
+model are especially welcome.