Adds instructions to the readme for setting up node/yarn in a project.

README.md

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+# Project Template
+
+This repository is a starter template.  
+Replace this README with documentation specific to your project once you begin development.
+
+The notes below apply only if you choose to build a Node.js project using this template.
+
+---
+
+## If your project will use Node.js
+
+Use Node 22 or newer for development.
+
+Check your version:
+
+```
+node --version
+```
+
+If your version is older than 22, update using nvm:
+
+```
+nvm install --lts
+```
+
+(Optional) Make the new version your default:
+
+```
+nvm alias default <version>
+```
+
+After running `yarn init`, you may add a minimum Node version requirement to your `package.json`:
+
+```json
+"engines": {
+  "node": ">=22"
+}
+```
+
+This helps ensure you do not accidentally use an outdated Node version.
+
+---
+
+## If your project will use Yarn (Berry)
+
+This template assumes modern Yarn (Yarn 4+), managed by Corepack.
+
+Enable Corepack:
+
+```
+corepack enable
+```
+
+Update Yarn to the latest stable version:
+
+```
+corepack prepare yarn@stable --activate
+```
+
+Install dependencies:
+
+```
+yarn install
+```
+
+If you want Yarn to error (instead of warn) when the Node version does not satisfy the `engines` field, add this to `.yarnrc.yml`:
+
+```yaml
+enableStrictEngineChecks: true
+```
+
+---
+
+## If your project will use containers
+
+If you plan to build or deploy using Docker, choose a base image that matches your development environment.  
+For Node.js projects, a common choice is:
+
+```
+FROM node:24
+```
+
+---
+
+## Replace this README
+
+Once you know what your project will be (Node, C++, Python, etc.), replace this file with documentation specific to your build, run, and deployment steps.