docs: Add quick Datadog setup guide

DATADOG_SETUP.md

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+# Datadog Synthetics GitHub Actions - Quick Setup
+
+## ✅ What's Been Done
+
+The Datadog Synthetics workflow is already configured in your repository at:
+`.github/workflows/datadog-synthetics.yml`
+
+The workflow is **correctly configured** with the required `api_key` and `app_key` inputs.
+
+## 🔑 What You Need to Do
+
+Add two secrets to your GitHub repository:
+
+### Step 1: Get Your Datadog Keys
+
+1. **API Key (`DD_API_KEY`)**:
+   - Go to Datadog → Organization Settings → API Keys
+   - Create or copy an existing API key
+
+2. **Application Key (`DD_APP_KEY`)**:
+   - Go to Datadog → Organization Settings → Application Keys
+   - Create a new application key
+
+### Step 2: Add Secrets to GitHub
+
+1. Go to: https://github.com/jumpstartscaling/net/settings/secrets/actions
+2. Click "New repository secret"
+3. Add first secret:
+   - Name: `DD_API_KEY`
+   - Value: [your Datadog API key]
+4. Add second secret:
+   - Name: `DD_APP_KEY`
+   - Value: [your Datadog App key]
+
+## ✨ That's It!
+
+Once you add these secrets, the workflow will automatically run on:
+- Every push to `main`
+- Every pull request to `main`
+
+It will run all Datadog Synthetic tests tagged with `e2e-tests`.
+
+## 📚 More Information
+
+See `.github/ACTIONS_SETUP.md` for detailed configuration options and troubleshooting.