Update readme

Author: mateuszstompor

.github/workflows/ruby.yml

@@ -1,6 +1,7 @@
 name: Ruby
 
 on:
+  push:
   pull_request:
 
 jobs:

README.md

@@ -1,4 +1,4 @@
-# KDTree · [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Build Status](https://github.com/mateuszstompor/kdtree/actions/workflows/ruby.yml/badge.svg)](https://github.com/mateuszstompor/kdtree/actions/workflows/ruby.yml)
+# KDTree · [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT) [![Build Status](https://github.com/mateuszstompor/kdtree/actions/workflows/ruby.yml/badge.svg?branch=master)](https://github.com/mateuszstompor/kdtree/actions/workflows/ruby.yml)
 
 
 ### About the project
@@ -63,3 +63,9 @@ There are many simple, easy to read tests, written with help of MiniTest gem
 ```bash
     $ sudo gem install kd_tree_ms-1.0.0.gem
 ```
+
+# Contributing
+Contributions are welcome! Please fork the repository and submit a pull request. For major changes, please open an issue first to discuss what you would like to change.
+
+# Contact
+For support or inquiries, please open an issue on the [GitHub repository](https://github.com/mateuszstompor/kdtree/issues).