Integration: add Reserp web search

integrations/reserp.md

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+---
+layout: integration
+name: Reserp
+description: Minimal Google Search API passthrough for Haystack
+authors:
+    - name: Reserp
+      socials:
+        github: reserp-ai
+        twitter: reserp_ai
+        linkedin: https://www.linkedin.com/company/reserp-ai
+pypi: https://pypi.org/project/reserp-haystack
+repo: https://github.com/reserp-ai/reserp-haystack
+type: Search & Extraction
+report_issue: https://github.com/reserp-ai/reserp-haystack/issues
+logo: /logos/reserp.png
+version: Haystack 2.0
+toc: true
+---
+
+## Overview
+
+[`Reserp`](https://reserp.ai/) is a Google Search API that accepts a complete Google Search URL and returns visible result blocks as structured JSON.
+
+`ReserpWebSearch` preserves Reserp as an unopinionated primitive inside Haystack. One component invocation makes one API request and exposes the public JSON response. Retries, timeouts, task queues, concurrency, caching, observability, and pagination remain under the pipeline's control.
+
+## Installation
+
+```bash
+pip install reserp-haystack
+```
+
+Set the API key in the environment:
+
+```bash
+export RESERP_API_KEY='your-api-key'
+```
+
+## Usage
+
+### Components
+
+- `ReserpWebSearch`: sends one complete Google Search URL to Reserp and exposes the public response under the `response` output.
+
+```python
+from haystack_integrations.components.websearch.reserp import ReserpWebSearch
+
+search = ReserpWebSearch()
+result = search.run(
+    url="https://www.google.com/search?q=haystack+ai&gl=us&hl=en"
+)
+
+print(result["response"])
+```
+
+See the complete [Reserp API documentation](https://reserp.ai/docs) for request, response, errors, and pagination.
+
+## License
+
+`reserp-haystack` is distributed under the MIT license.