Added contributing section

README.md

@@ -158,3 +158,22 @@ will return something like:
 ```
 
 See the [examples](https://github.com/ethauvin/cryptoprice/blob/master/examples/) for more details.
+
+## 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/cryptoprice.git
+```
+
+Then use [bld](https://rife2.com/bld) to build:
+
+```console
+cd cryptoprice
+./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.