add basic readme with demo

README.md

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+# Presenton: An Open-Source, Locally-Run AI Presentation Tool (Private Gamma Alternative)
+
+---
+
+**Presenton** is an open-source (Apache 2.0) app that runs locally on your device, giving you full control over your presentation workflow. Generate beautiful decks using powerful AI models like OpenAI, Anthropic, and others — all while keeping your data private and compliant. You bring your own API keys and choose the provider, ensuring no third-party service stores or processes your content beyond the AI model you select.
+
+---
+
+## Demo
+![Demo](resources/ui/readme/demo.gif)
+
+## ✨ Features
+
+* ✅ **Runs Locally** — All code runs on your device
+* ✅ **Privacy-First** — No tracking, no data stored by us
+* ✅ **Bring Your Own Key** — OpenAI, Gemini (More coming soon...)
+* ✅ **Flexible** — Generate presentations from prompts or outlines
+* ✅ **Export Ready** — Save as PowerPoint (PPTX) and PDF
+* ✅ **Fully Open-Source** — Apache 2.0 licensed
+