(docs) refer to GitHub in README

Author: alexey-pelykh

README.md

@@ -1,5 +1,6 @@
 # PCRE4J: PCRE for Java
 
+![GitHub Repo stars](https://img.shields.io/github/stars/alexey-pelykh/pcre4j?style=flat&logo=github)
 [![License](https://img.shields.io/github/license/alexey-pelykh/pcre4j)](https://www.gnu.org/licenses/lgpl-3.0.txt)
 [![CI](https://img.shields.io/github/check-runs/alexey-pelykh/pcre4j/main)](https://github.com/alexey-pelykh/pcre4j/actions/workflows/ci.yaml)
 [![codecov](https://codecov.io/gh/alexey-pelykh/pcre4j/graph/badge.svg?token=7UJZ501GWT)](https://codecov.io/gh/alexey-pelykh/pcre4j)
@@ -11,6 +12,8 @@ The PCRE4J project's goal is to bring the power of the [PCRE](https://www.pcre.o
 This project is brought to you by [Alexey Pelykh](https://github.com/alexey-pelykh) with a great gratitude to the PCRE
 library author [Philip Hazel](https://github.com/PhilipHazel) and its contributors.
 
+The source code is hosted on [GitHub](https://github.com/alexey-pelykh/pcre4j).
+
 ## Usage
 
 The PCRE4J library provides several APIs to interact with the PCRE library: