docs: guidelines: initial laravel/mcp guidelines (#267)

* docs: guidelines: initial laravel/mcp guidelines

Our documentation is great, so the guidelines don't need to be very detailed

* docs: guidelines: MCP - add http/https node issue

* Update core.blade.php

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Co-authored-by: Taylor Otwell <[email protected]>

Author: ashleyhindle

.ai/mcp/core.blade.php

@@ -0,0 +1,7 @@
+## Laravel MCP
+
+- MCP (Model Context Protocol) is very new. You must use the `search-docs` tool to get documentation for how to write and test Laravel MCP servers, tools, resources, and prompts effectively.
+- MCP servers need to be registered with a route or handle in `routes/ai.php`. Typically, they will be registered using `Mcp::web()` to register a HTTP streaming MCP server.
+- Servers are very testable - use the `search-docs` tool to find testing instructions.
+- Do not run `mcp:start`. This command hangs waiting for JSON RPC MCP requests.
+- Some MCP clients use Node, which has its own certificate store. If a user tries to connect to their web MCP server locally using https://, it could fail due to this reason. They will need to switch to http:// during local development.