Update README.md (#23)

README.md

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+
+> ⚠️ This project is still in beta and may have errors!  
+⚠️ If you found any error or bug, please open [issue](https://github.com/q1zZu/spaceis-sdk-java/issues) or contact with me via [discord](https://bit.ly/Q-CODES) *(open ticket)*.
+
 # spaceis-sdk-java
-Java sdk for https://api.spaceis.pl
+Java sdk for [SpaceIs](https://spaceis.pl) e-commerce platform.
+
+
+## **Supported endpoints:**
+- [License](https://api.spaceis.pl/#tag/Licencja)
+- [Daily reward](https://api.spaceis.pl/#tag/Dzienna-nagroda)
+- [Vouchers](https://api.spaceis.pl/#tag/Vouchery)
+- [Subpages](https://api.spaceis.pl/#tag/Podstrony)
+- [Discount code](https://api.spaceis.pl/#tag/Kody-rabatowe)
+- [Server commands](https://api.spaceis.pl/#tag/Komendy-dla-serwera)
+- [Transactions](https://api.spaceis.pl/#tag/Transakcje)
+- [Servers](https://api.spaceis.pl/#tag/Serwery)
+
+# Installation
+
+...
+
+# SpaceIsSdkClient
+
+**Client initalization**
+```java
+
+// Client with api key
+final SpaceIsSdk spaceIsSdkClient = new SpaceIsSdkClient(API_KEY);
+
+// Client with base url and api key.
+final SpaceIsSdk spaceIsSdkClient = new SpaceIsSdkClient(BASE_URL, API_KEY);
+
+// Client with custom configuration for Unirest.
+final SpaceIsSdk spaceIsSdkClient = new SpaceIsSdkClient(CONFIG);
+
+```
+
+Examples for usage can be found at: [wiki](https://github.com/q1zZu/spaceis-sdk-java/wiki)
+
+# Support and contact
+- Discord: [Q-CODES](https://bit.ly/Q-CODES) *(create ticket)*
+- Email: [email protected]
+
+
+
+