docs: Add Instant Clusters feature documentation

docs/pods/instant-clusters.md

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+---
+title: "Instant Clusters"
+description: "Learn how to deploy and manage multiple GPU machines together using RunPod's Instant Cluster feature."
+id: instant-clusters
+sidebar_position: 7
+---
+
+Instant Clusters is a feature that enables you to quickly deploy and manage multiple GPU machines as a unified cluster. This feature simplifies the process of setting up distributed computing environments for tasks that require multiple GPUs working together.
+
+## Overview
+
+With Instant Clusters, you can:
+- Deploy multiple GPU machines simultaneously
+- Manage them as a single unit
+- Connect to individual pods within the cluster
+- Scale your computing resources efficiently
+
+## Creating an Instant Cluster
+
+1. From the RunPod dashboard, select **Instant Cluster**.
+
+2. Configure your cluster:
+   - Specify the number of servers you want in your cluster
+   - Choose your GPU type
+   - Select a template for your pods
+   - Review and verify your settings
+
+3. Click **Deploy Cluster** to create your cluster.
+
+## Managing Your Cluster
+
+After deployment, you'll be redirected to the Clusters page. From here, you can:
+
+1. Select your cluster to view details
+2. Access the Pods page showing all pods in your cluster
+3. Connect to individual pods as needed
+4. Monitor the status and performance of your cluster
+
+## Connecting to Cluster Pods
+
+To connect to pods within your cluster:
+
+1. Navigate to the Pods page for your cluster
+2. Select the **Connect** button for the desired pod
+3. Choose your connection method based on your template type:
+   - SSH terminal
+   - Web terminal
+   - Jupyter notebook
+   - Other template-specific connections
+
+## Best Practices
+
+- Choose consistent templates across your cluster for better compatibility
+- Monitor resource usage across all pods
+- Use [Global Networking](networking.md) to enable secure communication between your cluster pods
+- Consider using network volumes for shared storage across your cluster
+
+## Limitations and Considerations
+
+- All pods in a cluster must use the same template
+- Resource availability may affect cluster deployment
+- Pricing is based on the cumulative resources of all pods in the cluster
+
+## Related Resources
+
+- [Global Networking](networking.md)
+- [Storage Options](storage/_volume.md)
+- [Pod Management](manage-pods.md)
+
+For additional support or questions about Instant Clusters, please [contact our support team](https://contact.runpod.io/hc/en-us/requests/new).