Enhance README with contribution and warning details

Added contribution guidelines and credits section to README.

README.md

@@ -1,5 +1,11 @@
 # Greek-IPTV
 
+<p align="center">
+	<a href="https://github.com/michatec/Greek-IPTV/issues"><img src="https://img.shields.io/github/issues-raw/michatec/Greek-IPTV.svg?style=flat-square&label=issues" /></a>
+	<a href="https://github.com/michatec/Greek-IPTV/graphs/contributors"><img src="https://img.shields.io/github/contributors/michatec/Greek-IPTV?style=flat-square" /></a>
+</p>
+<div align="center">
+
 ❤️ PRs is LOVE ❤️
 
 You can support me and contribute this beautiful list!
@@ -9,3 +15,31 @@ And I would like to say Thanks using this List!
 Two m3u8 one with Greek Radios and one with Greek TV.
 
 Greek TV m3u8 recommend to use with VPN to Greece.
+
+</div>
+
+----------------------------------------
+
+<details>
+<summary>❗Warning</summary>
+<br>
+<p>
+There’s no guarantee that all the stations are working.
+</p>
+</details>
+
+----------------------------------------
+
+<details>
+<summary>📜️ Credit</summary>
+  
+- Michatec for maintaining the lists
+- All the contributors who have contributed to the project by submitting pull requests, reporting issues, or providing feedback
+
+</details>
+
+<div align="right">
+<table><td>
+<a href="#start-of-content">↥ Scroll to top</a>
+</td></table>
+</div>