Add useSyncExternalStore hook snippet and update README

Author: alDuncanson

README.md

@@ -16,6 +16,7 @@ React Hooks Snippets is a [Visual Studio Code](https://code.visualstudio.com/) e
 | `udvh` | `useDeferredValue` |
 | `udbvh` | `useDebugValue` |
 | `uidh` | `useId` |
+| `usesh` | `useSyncExternalStore` |
 | `ueh` | `useEffect` |
 | `uleh` | `useLayoutEffect` |
 | `uieh` | `useInsertionEffect` |

snippets/snippets.json

@@ -34,6 +34,13 @@
 		],
 		"description": "React useId() hook"
 	},
+	"useSyncExternalStore": {
+		"prefix": "usesh",
+		"body": [
+			"const ${1:snapshot} = useSyncExternalStore(${2:subscribe}, ${3:getSnapshot}, ${4:getServerSnapshot});$0"
+		],
+		"description": "React useSyncExternalStore() hook"
+	},
 	"useEffect": {
 		"prefix": "ueh",
 		"body": [