docs(CONTRIBUTING): adds file used in developert-tooling repo

CONTRIBUTING.md

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+# Contributing
+
+Thank you for your interest in improving [faucet.celo.org](https://faucet.celo.org/).
+
+If you want to contribute, but aren't sure where to start, you can create a
+[new discussion](https://github.com/celo-org/faucet/discussions).
+
+There are multiple opportunities to contribute. It doesn't matter if you are just
+getting started or are an expert. We appreciate your interest in contributing.
+
+> **IMPORTANT**
+> Please ask before starting work on any significant new features.
+>
+> It's never a fun experience to have your pull request declined after investing time and effort
+> into a new feature. To avoid this from happening, we invite contributors to create a
+> [new discussion](https://github.com/celo-org/faucet/discussions) to discuss API changes or
+> significant new ideas.
+
+## Basic guide
+
+This guide is intended to help you get started with contributing. By following these steps,
+you will understand the development process and workflow.
+
+### Cloning the repository
+
+To start contributing to the project, clone it to your local machine using git:
+
+```sh
+$ git clone https://github.com/celo-org/faucet.git
+```
+
+Navigate to the project's root directory:
+
+```sh
+$ cd faucet
+```
+
+### Installing Node.js
+
+We use [Node.js](https://nodejs.org/en/) to run the project locally.
+You need to install the **Node.js version** specified in [.nvmrc](../.nvmrc). To do so, run:
+
+```sh
+$ nvm install
+$ nvm use
+```
+
+### Installing dependencies
+
+Once in the project's root directory, run the following command to install the project's
+dependencies:
+
+```sh
+$ yarn install
+```
+
+After installing the dependencies, the project is ready to be run.
+
+### Navigating the repository
+
+The project is structured into two apps located in the [`apps/`](./apps/) directory.
+
+1. The firebase app contains functions which do the actual fauceting.
+2. The web app contains a UI for making requests.
+
+### Running packages
+
+Once you navigated to the package directory you want to run, inspect the `package.json` file
+and look for the `scripts` section. It contains the list of available scripts that can be run.
+
+### Running the test suite
+
+Unfortunately, we don't have a consistent testing suite for the faucet.
+This is something we are working on improving.
+
+When you open a Pull Request, the GitHub CI will run any available test suites for you, but
+you can also add and run tests locally.
+
+> **INFO**
+> Some tests are run automatically when you open a Pull Request, while others are run when a
+> maintainer approves the Pull Request. This is for security reasons, as some tests require access
+> to secrets.
+
+### Open a Pull Request
+
+✅ Now you're ready to contribute to Celo SDK(s) and CLI(s)!