#228 Added link to developer wiki

README.md

@@ -16,6 +16,7 @@
 
 # <a name="toc">Table of Contents</a>
  - <a href="#introduction">Introduction</a>
+ - <a href="#contribute">How to contribute</a>
  - <a href="#faq">Frequently Asked Questions</a>
  - <a href="#credits">Credits</a>
  - <a href="#license">License</a>
@@ -34,6 +35,11 @@ problems, and it also improves code readability for coders and architects who
 are familiar with the patterns.
 
 
+# <a name="contribute">How to contribute</a> [&#8593;](#top)
+
+If you are willing to contribute to the project you will find the relevant information in our [developer wiki](https://github.com/iluwatar/java-design-patterns/wiki).
+
+
 # <a name="faq">Frequently asked questions</a> [&#8593;](#top)
 
 **<a id="Q1">Q: What is the difference between State and Strategy patterns?</a>**