Create CONTRIBUTING.md

CONTRIBUTING.md

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+Setup
+
+# Contributing to OnionShare
+
+## Prerequisites
+
+1. Python 3
+2. Poetry
+3. Tor _(package; you would also need tor browser is needed for desktop)_
+4. Go _(for desktop)_
+
+## Setting Up the Codebase
+Clone the repository:
+   ```bash
+   git clone https://github.com/onionshare/onionshare.git
+   cd onionshare
+   ```
+### 1. Setting Up the CLI (Required for Desktop)
+
+ Follow the setup instructions in `cli/Readme.md`:
+   ```bash
+   cd cli
+   poetry install
+   ```
+
+### 2. Setting Up the Desktop
+
+Navigate to the Desktop directory and follow the setup instructions in `desktop/Readme.md`:
+   ```bash
+   cd ../desktop
+   poetry install
+   ```
+
+### 3. Running OnionShare
+
+Run the desktop application:
+```bash
+poetry run onionshare-gui
+```
+
+Make sure `Tor` is running before starting OnionShare:
+```bash
+tor
+```
+
+## Contribution Guidelines
+
+1. Fork the repository and create a branch from `main`.
+2. Write clear commit messages.
+3. Run tests before submitting a pull request (PR).
+4. Open a PR to the main branch.
+5. Follow the [Code of Conduct](CODE_OF_CONDUCT.md).