docs: Add memory configuration documentation

Co-Authored-By: Joe Moura <joao@crewai.com>

docs/memory.md

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+# Memory Management in CrewAI
+
+CrewAI provides a robust memory system that allows agents to store and retrieve information across conversations and tasks.
+
+## Memory Types
+
+- **Short Term Memory**: Stores recent interactions and context
+- **Long Term Memory**: Persists important information for extended periods
+- **Entity Memory**: Tracks information about specific entities
+
+## Configuration
+
+### Embedding Providers
+
+CrewAI supports multiple embedding providers for memory storage. By default, it uses OpenAI, but you can configure different providers:
+
+```bash
+# OpenAI (default)
+export CREWAI_EMBEDDING_PROVIDER=openai
+export CREWAI_EMBEDDING_MODEL=text-embedding-3-small
+export OPENAI_API_KEY=your_key
+
+# Ollama
+export CREWAI_EMBEDDING_PROVIDER=ollama
+export CREWAI_EMBEDDING_MODEL=llama2
+export CREWAI_OLLAMA_URL=http://localhost:11434/api/embeddings  # Optional
+```
+
+### Memory Operations
+
+Reset all memories:
+```bash
+crewai reset-memories -a
+```
+
+The memory system will use the configured embedding provider for all operations, including memory reset.