Add QA Automation Gateway testimonial under Platforms (#1380)

Added a new testimonial entry for "QA Automation Gateway — AI-driven Orchestration for Performance Testing" under the Platforms section.
Highlights how MCP Context Forge enables automation and significant time savings in correlating NeoLoad and Dynatrace performance data.

Author: sumitg-ai

docs/docs/media/testimonials/index.md

@@ -4,3 +4,5 @@
 
 - **IBM Consulting Advantage**
   [IBM Consulting Advantage](https://www.ibm.com/consulting/advantage) - AI-tooling platform, equipping 160,000 expert consultants with role, industry and business domain-specific AI assistants, agents, and applications.
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+- **[QA Automation Gateway](https://medium.com/@sumitgprofessional01/qa-mcp-gateway-neoload-dynatrace-correlation-tool-using-ibms-mcp-contextforge-gateway-11341a5fc9dd) - AI-driven Orchestration for Performance Testing** - Using IBM MCP Context Forge, we built the QA Automation Gateway — an intelligent orchestration layer that unifies NeoLoad and Dynatrace metrics into a single automated workflow. What earlier took hours of manual correlation and reporting now completes in minutes.