Kick off the SDK based on Symfony's MCP SDK

CHANGELOG.md

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+CHANGELOG
+=========
+
+0.1
+---
+
+ * Add Model Context Protocol (MCP) implementation for LLM-application communication
+ * Add JSON-RPC based protocol handling with `JsonRpcHandler`
+ * Add three core MCP capabilities:
+   - Resources: File-like data readable by clients (API responses, file contents)
+   - Tools: Functions callable by LLMs (with user approval)
+   - Prompts: Pre-written templates for specific tasks
+ * Add multiple transport implementations:
+   - Symfony Console Transport for testing and CLI applications
+   - Stream Transport supporting Server-Sent Events (SSE) and HTTP streaming
+   - STDIO transport for command-line interfaces
+ * Add capability chains for organizing features:
+   - `ToolChain` for tool management
+   - `ResourceChain` for resource management
+   - `PromptChain` for prompt template management
+ * Add Server component managing transport connections
+ * Add request/notification handlers for MCP operations
+ * Add standardized interface enabling LLMs to interact with external systems
+ * Add support for building LLM "plugins" with extra context capabilities