Add pre-requesites to the CONTRIBUTING file

Author: fbenevides

CONTRIBUTING.md

@@ -2,6 +2,17 @@
 
 We want this community to be friendly and respectful to each other. Please follow it in all your interactions with the project.
 
+## Prerequesites
+
+### NVM
+You can find the installation guide [here](https://heynode.com/tutorial/install-nodejs-locally-nvm/)
+
+### Yarn
+On MacOS
+```bash
+brew install yarn 
+```
+
 ## Development workflow
 
 To get started with the project, run `yarn` in the root directory to install the required dependencies for each package: