initial commit: slides + practica_resueltos + README

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

slides/pages/rag/06.md

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+---
+layout: default
+---
+
+# Proveedores de Embeddings
+
+LangChain soporta múltiples proveedores de embeddings:
+
+<v-clicks>
+
+### OpenAI
+```typescript
+import { OpenAIEmbeddings } from "@langchain/openai";
+
+const embeddings = new OpenAIEmbeddings({
+  model: "text-embedding-3-small", // o text-embedding-3-large
+});
+```
+
+### Google (Vertex AI / Gemini)
+```typescript
+import { GoogleEmbeddings } from "@langchain/google";
+
+const embeddings = new GoogleEmbeddings({
+  model: "text-embedding-004",
+});
+```
+
+</v-clicks>