add readme

packages/zitadel-client/README.md

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+# ZITADEL Client
+
+This package exports services and utilities to interact with ZITADEL
+
+## Installation
+
+To install the package, use npm or yarn:
+
+```sh
+npm install @zitadel/client
+```
+
+or
+
+```sh
+yarn add @zitadel/client
+```
+
+## Usage
+
+### Importing Services
+
+You can import and use the services provided by this package to interact with ZITADEL.
+
+```ts
+import { createUserServiceClient } from "@zitadel/client";
+
+const userService = createUserServiceClient({
+  // Configuration options
+});
+```
+
+### Utilities
+
+This package also provides various utilities to work with ZITADEL
+
+```ts
+import { timestampMs } from "@zitadel/client";
+
+// Example usage
+console.log(`${timestampMs(session.creationDate)}`);
+```