docs: add node-builtin-specifier lint rule

lint/rules/node-builtin-specifier.md

@@ -0,0 +1,28 @@
+---
+tags: [recommended]
+---
+
+Enforces the use of the `node:` specifier for Node built-in modules.
+
+Deno requires Node built-in modules to be imported with the `node:` specifier.
+Importing them with a bare specifier (e.g. `"fs"`) is not supported and only
+works by accident in some setups, so this rule reports a warning and offers a
+quick fix that adds the `node:` prefix.
+
+### Invalid:
+
+```typescript
+import * as path from "path";
+import * as fs from "fs";
+import * as fsPromises from "fs/promises";
+await import("os");
+```
+
+### Valid:
+
+```typescript
+import * as path from "node:path";
+import * as fs from "node:fs";
+import * as fsPromises from "node:fs/promises";
+await import("node:os");
+```