Update README and POM File

Motivation:
To streamline and improve the readability of the extensive README document.

Modification:
Simplified and updated the README and POM files for better clarity and maintenance.

Result:
The README and POM files are now concise, cleaner, and up-to-date.

README.md

@@ -36,10 +36,6 @@ This driver provides the following features:
 - [x] Extensible, e.g. extend built-in `Codec`(s).
 - [x] MariaDB `RETURNING` clause.
 
-## Maintainer
-
-This project is currently being maintained by [@jchrys](https://github.com/jchrys)
-
 ## Version compatibility / Integration tests states
 ![MySQL 5.5 status](https://img.shields.io/badge/MySQL%205.5-pass-blue)
 ![MySQL 5.6 status](https://img.shields.io/badge/MySQL%205.6-pass-blue)
@@ -145,6 +141,10 @@ This project is released under version 2.0 of the [Apache License](https://www.a
 
 ## Contributors
 
+<a href="https://github.com/asyncer-io/r2dbc-mysql/graphs/contributors">
+  <img src="https://contrib.rocks/image?repo=asyncer-io/r2dbc-mysql" />
+</a>
+
 Thanks a lot for your support!
 
 ## Supports

r2dbc-mysql/pom.xml

@@ -28,7 +28,15 @@
       <name>jchrys</name>
       <email>[email protected]</email>
       <roles>
-        <role>Project Lead</role>
+        <role>Maintainer</role>
+      </roles>
+    </developer>
+    <developer>
+      <id>mirromutth</id>
+      <name>mirromutth</name>
+      <email>[email protected]</email>
+      <roles>
+        <role>Maintainer</role>
       </roles>
     </developer>
   </developers>