feat: add README

Author: jonioni

docs/rules/no-parent-barrel-import.md

@@ -0,0 +1,43 @@
+# import/no-parent-barrel-import
+
+<!-- end auto-generated rule header -->
+
+Forbid a module from importing from parent barrel file. This often leads to runtime error `Cannot read ... of undefined`.
+
+## Rule Details
+
+### Fail
+
+```js
+// foo/index.ts
+export * from "./bar";
+export * from "./baz";
+
+// foo/bar.ts (cannot read property `X` of undefined)
+import { T } from '..';
+
+export const X = T.X;
+
+// foo/baz.ts
+export enum T {
+  X = "..."
+}
+```
+
+### Pass
+
+```js
+// foo/index.ts
+export * from "./bar";
+export * from "./baz";
+
+// foo/bar.ts (relative import for code in `foo/`)
+import { T } from "./baz";
+
+export const X = T.X;
+
+// foo/baz.ts
+export enum T {
+  X = "..."
+}
+```