Add new CONTRIBUTING.md file

Author: Ygnas

CONTRIBUTING.md

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+# Contributing to the Codeflare SDK
+
+Thank you for your interest in contributing to the Codeflare SDK!
+
+## Getting Started
+
+### Prerequisites
+
+- Python 3.9
+- [Poetry](https://python-poetry.org/)
+
+### Setting Up Your Development Environment
+
+1. **Clone the repository:**
+
+   ```sh
+   git clone https://github.com/project-codeflare/codeflare-sdk.git
+   cd codeflare-sdk
+   ```
+
+2. Create a Poetry virtual environment:
+
+   ```sh
+   poetry shell
+   ```
+
+3. Install dependencies:
+
+   ```sh
+   poetry install
+   ```
+
+    - To include test dependencies, run:
+
+      ```sh
+      poetry install --with test
+      ```
+
+    - To include docs dependencies, run:
+
+      ```sh
+      poetry install --with docs
+      ```
+
+    - To include both test and docs dependencies, run:
+
+      ```sh
+      poetry install --with test,docs
+      ```
+
+## Development Workflow
+
+### Pre-commit
+
+We use pre-commit to ensure consistent code formatting. To enable pre-commit hooks, run:
+
+```sh
+pre-commit install
+```
+
+## Testing
+
+To install Codeflare SDK in editable mode, run:
+
+```sh
+pip install -e .
+```
+
+### Unit Testing
+
+To run the unit tests, execute:
+
+```sh
+pytest -v tests/unit_test.py
+```
+
+### Local e2e Testing
+
+- Please follow the [e2e documentation](https://github.com/project-codeflare/codeflare-sdk/blob/main/docs/e2e.md)
+
+#### Code Coverage
+
+- Run tests with the following command: `coverage run -m --source=src pytest tests/unit_test.py`
+- To then view a code coverage report w/ missing lines, run `coverage report -m`
+
+### Code Formatting
+
+- To check file formatting, in top-level dir run `black --check .`
+- To auto-reformat all files, remove the `--check` flag
+- To reformat an individual file, run `black <filename>`