improved readme

Author: golsch

README.md

@@ -1,2 +1,17 @@
 # js-common
-common Javascript code for frontend development
+A common Javascript code for MyCoRe frontend development.
+
+## Add package
+```
+npx jsr add @mycore/js-common
+```
+
+## Usage example
+```ts
+import { LangService } from '@mycore/js-common/i18n';
+
+const langService = new LangService(BASE_URL);
+console.log(langService.getLanguages());
+```
+
+

jsr.json

@@ -1,6 +1,6 @@
 {
   "name": "@mycore-test/js-common",
-  "version": "0.1.23",
+  "version": "0.1.24",
   "exports": {
     "./i18n": "./src/i18n/index.ts",
     "./access-key": "./src/access-key/index.ts",