improve yellowstone-grpc-api docs

add-ons/yellowstone-grpc-api/README.md

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   Power your Solana dApps and backends with the fastest, most reliable streaming
   data available. Yellowstone gRPC add-on is for apps that need every live event
   as fast as the network can deliver.
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 # Yellowstone gRPC API
 
+## Overview
+
+**Yellowstone gRPC** is a high-performance Solana Geyser plugin that provides real-time streaming access to on-chain data. Built by Triton One, it delivers blocks, transactions, and account updates with millisecond-level latency directly from Solana validators.
+
+GetBlock offers **managed Yellowstone gRPC endpoints** as an add-on to Dedicated Solana Node subscriptions, eliminating the need for infrastructure setup and maintenance.
+
+***
+
+## Key Features
+
+* **Near-zero latency**: Streams data directly from validators, often hundreds of milliseconds faster than standard RPC/WebSocket APIs
+* **High throughput**: Handles millions of events per minute under load
+* **Comprehensive streaming**: Monitor accounts, transactions, blocks, slots, and program interactions in real-time
+* **Rich filtering**: Subscribe only to relevant updates using account keys, owner programs, or commitment levels
+* **Protobuf encoding**: Receive parsed, typed messages instead of raw base64 data
+* **Bidirectional streaming**: Maintain long-lived connections with built-in keep-alives
+
+***
+
+## Supported Data Streams
+
+Yellowstone gRPC supports streaming the full range of Solana events:
+
+| Stream Type      | Description                                                      |
+| ---------------- | ---------------------------------------------------------------- |
+| **Accounts**     | Real-time account updates including lamports, owner, and data    |
+| **Transactions** | Full transaction data with metadata and instruction details      |
+| **Blocks**       | Block metadata including slot, parent slot, and timestamp        |
+| **Slots**        | Slot notifications as they're processed by the leader            |
+| **Block Meta**   | Block metadata with transaction counts and execution status      |
+
+***
+
+## Use Cases
+
+Yellowstone gRPC is ideal for time-sensitive applications that need to react instantly to on-chain state changes:
+
+* High-frequency trading and MEV bots
+* On-chain indexers and data archives
+* Real-time analytics dashboards
+* DEX monitors and price feeds
+* DeFi strategy engines
+* Alerting and notification systems
+* NFT marketplace trackers
+* Wallet activity monitors
+
+{% hint style="info" %}
+**Note**: gRPC is not supported in browsers. Yellowstone is designed for backend services and server-side applications.
+{% endhint %}
+
+***
+
+## Getting Started
+
+<table data-view="cards"><thead><tr><th></th><th></th><th data-hidden data-card-target data-type="content-ref"></th></tr></thead><tbody><tr><td><mark style="color:blue;"><strong>Overview</strong></mark></td><td>Learn how Yellowstone gRPC works and why it's essential for real-time Solana applications</td><td><a href="overview.md">overview.md</a></td></tr><tr><td><mark style="color:blue;"><strong>Quickstart Guide</strong></mark></td><td>Enable the add-on and start streaming data with code examples in TypeScript, Python, Go, and Rust</td><td><a href="quickstart-guide.md">quickstart-guide.md</a></td></tr></tbody></table>
+
+***
+
+## Prerequisites
+
+To use Yellowstone gRPC on GetBlock:
+
+* A GetBlock account (sign up at [getblock.io](https://getblock.io))
+* A [Dedicated Solana Node](https://docs.getblock.io/getting-started/plans-and-limits/choosing-your-plan) subscription
+* Yellowstone gRPC add-on enabled (included at no extra cost with Dedicated Nodes)
+
+***
+
+## Quick Example
+
+Here's a minimal TypeScript example to start streaming account updates:
+
+```typescript
+import Client, {
+  SubscribeRequest,
+  CommitmentLevel
+} from "@triton-one/yellowstone-grpc";
+
+const client = new Client("https://go.getblock.io/", "YOUR_ACCESS_TOKEN");
+const stream = await client.subscribe();
+
+stream.write({
+  accounts: ["YourWalletPubkeyHere"],
+  commitment: CommitmentLevel.PROCESSED,
+} as SubscribeRequest);
+
+stream.on("data", (msg) => {
+  if (msg.accountChange) {
+    console.log(`Account updated: ${msg.accountChange.pubkey}`);
+  }
+});
+```
+
+***
+
+## Additional Resources
+
+* [Yellowstone gRPC GitHub Repository](https://github.com/rpcpool/yellowstone-grpc)
+* [GetBlock Solana Nodes](https://getblock.io/nodes/sol/)
+* [GetBlock Support](https://getblock.io/contact/)
+
+***
+
+## Need Help?
+
+Our support team is available 24/7 to assist with:
+
+* Add-on activation and endpoint setup
+* Integration guidance and troubleshooting
+* Performance optimization
+* Custom solutions for enterprise needs
+
+Contact us through the [GetBlock dashboard](https://getblock.io) or visit our [support page](https://getblock.io/contact/).
+