Add Makefile, package.json, and initial configuration for VitePress and Slidev integration

- Introduced a Makefile for streamlined commands related to building, running, and managing presentations.
- Created package.json to define project metadata, dependencies, and scripts for development and testing.
- Added .gitignore entries to exclude build artifacts and temporary files from version control.
- Included playwright.config.mjs for end-to-end testing setup with Playwright.
- Added README.md for project documentation, outlining setup instructions and development guidelines.

slides/spring-ai/slides.md

@@ -0,0 +1,43 @@
+---
+theme: default
+title: Spring AI
+info: |
+  Démo technique — portail talks
+highlighter: shiki
+defaults:
+  layout: center
+---
+
+# Spring AI
+
+Intégration **LLM** dans une stack Java familière.
+
+---
+
+## Objectifs
+
+- Abstractions stables (prompts, chat, embeddings)
+- Choix de backends (OpenAI, Ollama, etc.)
+- Testabilité et observabilité
+
+---
+
+## Exemple de flux
+
+```text
+Controller → ChatClient → Model (provider)
+```
+
+---
+
+## Bonnes pratiques
+
+- Isoler les prompts et versions
+- Mesurer latence et coûts
+- Prévoir reprise et timeouts
+
+---
+
+## Merci
+
+[Documentation Spring AI](https://docs.spring.io/spring-ai/reference/)