Added contributing section

README.md

@@ -127,7 +127,7 @@ try {
 }
 ```
 
-```
+```console
 Status Code: 400
 Error: Sorry, the URL you entered is on our internal blacklist. It may have been used abusively in the past, or it may link to another URL redirection service.
 ```
@@ -139,3 +139,22 @@ Additionally, link can be shortened using [v.gd](https://v.gd/) by setting the `
 ```kotlin
 Isgd.shorten("https://www.example.com/", isVgd = true) // returns https://v.gd/2z2ncj
 ```
+
+## Contributing
+
+If you want to contribute to this project, all you have to do is clone the GitHub
+repository:
+
+```console
+git clone git@github.com:ethauvin/isgd-shorten.git
+```
+
+Then use [bld](https://rife2.com/bld) to build:
+
+```console
+cd isgd-shorten
+./bld compile
+```
+
+The project has an [IntelliJ IDEA](https://www.jetbrains.com/idea/) project structure. You can just open it after all
+the dependencies were downloaded and peruse the code.