added metadata and test

README.md

@@ -13,6 +13,7 @@
 *   **Social Connectivity**: Follow users and manage contact lists.
 *   **Rich Feeds**: Access follow-based timelines, global discovery, and hashtag-based searches.
 *   **Encrypted Messaging**: Secure NIP-17 direct messages.
+*   **Profile Management**: Update account metadata (Kind 0) with support for standard and custom fields.
 *   **Extensible Architecture**: Clean separation between protocol logic (NIPs) and high-level functions.
 
 ---
@@ -67,6 +68,24 @@ let event_id = en.post_text("Building with EasyNostr is awesome!").await?;
 println!("Successfully posted! Event ID: {}", event_id);
 ```
 
+### 👤 Profile & Metadata
+
+Update account information (NIP-01) including support for custom fields (e.g., bot, birthday).
+
+```rust
+en.set_metadata(
+    Some("user_name".to_string()),
+    Some("Display Name".to_string()),
+    Some("About me...".to_string()),
+    Some("user@domain.com".to_string()), // NIP-05
+    Some("user@getalby.com".to_string()), // LUD-16
+    Some("https://website.com".to_string()),
+    Some("https://banner.com/img.png".to_string()),
+    Some(false), // bot (custom field)
+    Some("1990-01-01".to_string()), // birthday (custom field)
+).await?;
+```
+
 ### 📰 Social Feeds
 
 #### Timeline (Followed Users)