add `AGENTS.md` for opencode

AGENTS.md

@@ -0,0 +1,20 @@
+# trainable-ai
+
+This is a [Vike](https://vike.dev) project. The backend is [Hono](https://hono.dev) accepting requests and a [tRPC](https://trpc.io) server behind that. The frontend is a [React](https://reactjs.org) app using [Mantine UI](https://mantine.dev) for UI and [Zustand](https://github.com/pmndrs/zustand) for state management, but of course with Vike's [React integration](https://vike.dev/react).
+
+## Goal
+
+To create a chatbot that can learn from its interactions with users. The goal is that the user will not have to tell the chatbot to remember anything explicitly; rather, the chatbot will learn from the conversation and remember things on its own.
+
+## Project Structure
+
+- `/assets`: Contains static assets such as images and fonts.
+- `/components`: Contains React components
+- `/database`: Contains modules exporting ready-to-use database clients so server functions can just query the databases without initializing them. Right now, only PostgreSQL is used; but eventually we will use Milvus as well. `todoItems.ts` is just a toy file.
+  - `/generated`: Contains Typescript types generated from the PostgreSQL database schema using Kanel.
+- `/layouts`: Contains React layout components intended to be used as generic layouts for pages. Other than that there is nothing special about this directory; it is not treated any differently than any other directory, and is only named `layouts` for organizational purposes.
+- `/pages`: Contains the pages of the app, where a file's path is the page's URL path. This is in line with Vike's convention. This is a special directory.
+- `/server`: Contains modules intended to be used on the server-side. There is not yet any particular organization within this directory.
+- `/trpc`: Contains the tRPC code for the server, router/routes, and client.
+- `/types.ts`: Contains the types used by the app. This does not have to be a monolithic file; it can be split into multiple files if it makes sense to do so.
+- `/state.ts`: Contains the Zustand state management code.