Update docs

packages/example/src/localstorage.ts

@@ -0,0 +1,36 @@
+import { KeyValueStore } from "@effect/platform"
+import { BrowserKeyValueStore, BrowserStream } from "@effect/platform-browser"
+import { Effect, Option, Stream } from "effect"
+import { Lens } from "effect-lens"
+
+
+Effect.gen(function*() {
+    //      \/ Lens<Option.Option<string>, PlatformError, PlatformError, never, never>
+    const lens = Effect.all([
+        KeyValueStore.KeyValueStore,
+        Effect.succeed("someKey"),
+    ]).pipe(
+        Effect.map(([kv, key]) => Lens.make({
+            get: kv.get(key),
+
+            changes: kv.get(key).pipe(
+                Effect.map(Stream.make),
+                Effect.map(a => Stream.concat(
+                    a,
+                    BrowserStream.fromEventListenerWindow("storage").pipe(
+                        Stream.filter(event => event.key === key),
+                        Stream.map(event => Option.fromNullable(event.newValue)),
+                    ),
+                )),
+                Stream.unwrap,
+            ),
+
+            set: a => Option.isSome(a)
+                ? kv.set(key, a.value)
+                : kv.remove(key),
+        })),
+
+        Effect.provide(BrowserKeyValueStore.layerLocalStorage),
+        Lens.unwrap,
+    )
+})