Add Plus AI MCP server description to README (#2992)

Author: zfine87

README.md

@@ -412,6 +412,7 @@ Official integrations are maintained by companies building production ready MCP
 - <img height="12" width="12" src="https://www.plugged.in/favicon.ico" alt="Plugged.in Logo" /> **[Plugged.in](https://github.com/VeriTeknik/pluggedin-mcp)** - A comprehensive proxy that combines multiple MCP servers into a single MCP. It provides discovery and management of tools, prompts, resources, and templates across servers, plus a playground for debugging when building MCP servers.
 - <img height="12" width="12" src="https://p-link.io/favicon.ico" alt="P-Link.io Logo" /> **[P-Link.io](https://github.com/paracetamol951/P-Link-MCP)** - HTTP 402 Protocol implementation on Solana network. Sending & receiving payments for agents
 - <img height="12" width="12" src="https://polymarket.com/favicon.ico" alt="Polymarket Logo" /> **[Polymarket](https://github.com/ozgureyilmaz/polymarket-mcp)** - Real-time prediction market data from Polymarket - search markets, analyze prices, identify trading opportunities.
+- <img height="12" width="12" src="https://plusai.com/622ffb3448f15ce7a33c6a2b/652d81ccc31a7d50861db0ef_plus_favicon.ico" alt="Plus AI Logo" /> **[Plus AI](https://plusai.com/features/mcp)** - A Model Context Protocol (MCP) server for automatically generating professional PowerPoint and Google Slides presentations using the [Plus AI](https://plusai.com/) presentation API.
 - <img height="12" width="12" src="https://github.com/port-labs/port-mcp-server/blob/main/assets/port_symbol_white.svg" alt="Port Logo" /> **[Port IO](https://github.com/port-labs/port-mcp-server)** - Access and manage your software catalog to improve service quality and compliance.
 - **[PostHog](https://github.com/posthog/mcp)** - Interact with PostHog analytics, feature flags, error tracking and more with the official PostHog MCP server.
 - <img height="12" width="12" src="https://postidentity.com/favicon.ico" alt="PostIdentity Logo" /> **[PostIdentity](https://github.com/PostIdentity/mcp-server)** - Generate AI-powered social media posts from any AI assistant. Manage identities, create posts, track referrals, and browse marketplace templates, powered by [PostIdentity](https://postidentity.com).