Improve contributing document

Author: HudsonGraeme

CONTRIBUTING.md

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+# Developer Guide
+
+This document provides a guide for developers who contribute to the Omron subnet.
+
+## Adding Dependencies
+
+We use `uv` to manage dependencies. To add new dependencies, follow the steps below:
+
+1. Add the package to `pyproject.toml`:
+
+```sh
+uv add <package-name>
+```
+
+2. Lock dependencies and generate `requirements.txt`:
+
+```sh
+uv lock
+uv export -o requirements.txt
+```
+
+3. Sync dependencies:
+
+```sh
+uv sync --locked
+```
+
+## Updating Dependencies
+
+To force uv to update all packages in an existing `pyproject.toml`, run `uv sync --upgrade`.
+
+```sh
+# only update the bittensor package
+$ uv sync --upgrade-package bittensor
+
+# update both the bittensor and requests packages
+$ uv sync --upgrade-package bittensor --upgrade-package requests
+
+# update the bittensor package to the latest, and requests to v2.0.0
+$ uv sync --upgrade-package bittensor --upgrade-package requests==2.0.0
+```
+
+## Running Locally for Development
+
+For local development, we suggest running a [local devnet node](https://github.com/inference-labs-inc/bittensor-devnet).
+
+### Miner
+
+```sh
+python ./neurons/miner.py --localnet
+```
+
+### Validator
+
+```sh
+python ./neurons/validator.py --localnet
+```