docs(evals): add README with usage examples and options reference

.changeset/evals-readme.md

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+---
+"@voltagent/evals": patch
+---
+
+Add README documentation

packages/evals/README.md

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+<div align="center">
+<a href="https://voltagent.dev/">
+<img width="1500" height="276" alt="voltagent" src="https://github.com/user-attachments/assets/d9ad69bd-b905-42a3-81af-99a0581348c0" />
+</a>
+
+<h3 align="center">
+AI Agent Engineering Platform
+</h3>
+
+<div align="center">
+    <a href="https://voltagent.dev">Home Page</a> |
+    <a href="https://voltagent.dev/docs/">Documentation</a> |
+    <a href="https://github.com/voltagent/voltagent/tree/main/examples">Examples</a>
+</div>
+</div>
+
+<br/>
+
+<div align="center">
+
+[![GitHub issues](https://img.shields.io/github/issues/voltagent/voltagent)](https://github.com/voltagent/voltagent/issues)
+[![GitHub pull requests](https://img.shields.io/github/issues-pr/voltagent/voltagent)](https://github.com/voltagent/voltagent/pulls)
+[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
+[![npm version](https://img.shields.io/npm/v/@voltagent/evals.svg)](https://www.npmjs.com/package/@voltagent/evals)
+[![npm downloads](https://img.shields.io/npm/dm/@voltagent/evals.svg)](https://www.npmjs.com/package/@voltagent/evals)
+[![Discord](https://img.shields.io/discord/1361559153780195478.svg?label=&logo=discord&logoColor=ffffff&color=7389D8&labelColor=6A7EC2)](https://s.voltagent.dev/discord)
+
+</div>
+
+## @voltagent/evals
+
+Experiment orchestration utilities for VoltAgent. Define a dataset, a runner, and a set of scorers with `createExperiment`, then execute them with `runExperiment` to get aggregated pass/fail and score summaries — locally, in CI, or against a VoltOps-managed dataset.
+
+---
+
+## Install
+
+```bash
+npm install @voltagent/core @voltagent/evals @voltagent/scorers @voltagent/sdk
+# or
+yarn add @voltagent/core @voltagent/evals @voltagent/scorers @voltagent/sdk
+# or
+pnpm add @voltagent/core @voltagent/evals @voltagent/scorers @voltagent/sdk
+```
+
+## Usage
+
+Define an experiment with `createExperiment`:
+
+```typescript
+import { Agent } from "@voltagent/core";
+import { createExperiment } from "@voltagent/evals";
+
+const supportAgent = new Agent({
+  name: "support-agent",
+  instructions: "You are a helpful assistant that answers questions concisely and accurately.",
+  model: "openai/gpt-4o-mini",
+});
+
+export const experiment = createExperiment({
+  id: "offline-smoke",
+  label: "Offline Regression Smoke Test",
+  description: "Demonstrates createExperiment + runExperiment without VoltOps connectivity.",
+  dataset: {
+    name: "support-qa",
+    items: [
+      { input: "How do I reset my password?", expected: "Use the reset link on the login page." },
+    ],
+    // To use a VoltOps-managed dataset instead, create one at https://console.voltagent.dev/evals/datasets
+  },
+  runner: async ({ item }) => {
+    const result = await supportAgent.generateText(item.input);
+    return { output: result.text };
+  },
+  scorers: [], // see "Scorers" below
+  passCriteria: {
+    type: "meanScore",
+    min: 0.5,
+  },
+});
+```
+
+Then run it with `runExperiment`:
+
+```typescript
+import { runExperiment } from "@voltagent/evals";
+import { experiment } from "./experiment";
+
+const result = await runExperiment(experiment, {
+  onProgress: ({ completed, total }) => {
+    console.log(`Processed ${completed}/${total ?? "?"} items`);
+  },
+});
+
+console.log({
+  success: result.summary.successCount,
+  failures: result.summary.failureCount,
+  errors: result.summary.errorCount,
+  meanScore: result.summary.meanScore,
+  passRate: result.summary.passRate,
+});
+```
+
+### `RunExperimentOptions`
+
+| Option          | Type                                                                      | Description                                                            |
+| --------------- | ------------------------------------------------------------------------- | ---------------------------------------------------------------------- |
+| `concurrency`   | `number`                                                                  | Maximum number of dataset items to process in parallel                 |
+| `signal`        | `AbortSignal`                                                             | Abort the experiment run                                               |
+| `voltOpsClient` | client instance                                                           | Used to resolve VoltOps-managed datasets and report results to VoltOps |
+| `onItem`        | `(event) => void \| Promise<void>`                                        | Called after each dataset item finishes, with its result and score     |
+| `onProgress`    | `(event: { completed: number; total?: number }) => void \| Promise<void>` | Called after each dataset item finishes, with overall progress         |
+
+## Scorers
+
+Pass scorer definitions from [`@voltagent/scorers`](https://github.com/VoltAgent/voltagent/tree/main/packages/scorers) (or your own custom scorers) via `scorers` on `createExperiment`. Each scorer receives the runner's input/output and returns a score that feeds into the experiment summary and `passCriteria`.
+
+## VoltOps Integration
+
+If a `voltOpsClient` is provided (either via `runExperiment` options or `config.voltOps.client`), datasets can be loaded from and experiment runs reported to your [VoltOps](https://console.voltagent.dev) project.
+
+## Example
+
+See [`examples/with-offline-evals`](https://github.com/VoltAgent/voltagent/tree/main/examples/with-offline-evals) for a complete, runnable experiment with a local dataset and scorers.
+
+## Documentation
+
+- [VoltAgent Documentation](https://voltagent.dev/docs/)
+- [Evals Overview](https://voltagent.dev/docs/evals/overview/)
+
+## License
+
+Licensed under the MIT License, Copyright © 2026-present VoltAgent.