The project seems to require yarn but it's not installed

I see that you're encountering an issue with the project requiring yarn but it's not installed. To resolve this, you can follow these steps:

1. First, check if you have Node.js installed on your system. Yarn requires Node.js to work properly. You can check the version of Node.js by running the command `node -v` in your terminal.

2. If Node.js is not installed, you can download and install it from the official Node.js website (https://nodejs.org). Choose the appropriate installer for your operating system and follow the installation instructions.

3. Once Node.js is installed, you can install yarn using npm (Node Package Manager). Open your terminal and run the following command:

   npm install -g yarn

This will install yarn globally on your system.

4. After successful installation, you can verify if yarn is installed by running the command `yarn -v` in your terminal. If it shows the version number, then yarn is installed correctly.

Now you should have yarn installed on your system, and you can proceed with your project. If you still encounter any issues, please provide more details about the error messages you're seeing so that I can assist you further.