📝 Add installation and usage to README.md

Author: NatoBoram

README.md

@@ -3,3 +3,18 @@
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 Exports all first-party ast-grep languages
+
+## Installation
+
+```sh
+pnpm i @coderabbitai/ast-grep-langs
+```
+
+## Usage
+
+```ts
+import { registerDynamicLanguage } from "@ast-grep/napi"
+import { langs } from "@coderabbitai/ast-grep-langs"
+
+registerDynamicLanguage(langs)
+```