docs: initial api reference docs (#5352)

docs/reference/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "@affine/docs",
+  "type": "module",
+  "private": true,
+  "scripts": {
+    "build": "typedoc --options ../../typedoc.json",
+    "dev": "nodemon --exec 'typedoc --options ../../typedoc.json' & serve dist/"
+  },
+  "devDependencies": {
+    "nodemon": "^3.0.1",
+    "serve": "^14.2.1",
+    "typedoc": "^0.25.4"
+  },
+  "nodemonConfig": {
+    "watch": [
+      "./readme.md",
+      "../../packages/*/*/src/*.ts",
+      "../../**/typedoc{.base,}.json"
+    ],
+    "ext": "ts,md,json"
+  },
+  "version": "0.10.3-canary.2"
+}

docs/reference/readme.md

@@ -0,0 +1,7 @@
+Welcome to AFFiNE development reference.
+
+This document is intended for developers who want to contribute to AFFiNE. It contains information about the architecture of AFFiNE, how to build it, and how to contribute to it.
+
+### The Infrastructure of AFFiNE
+
+see {@link @toeverything/infra!}