Update documentation #1

CONTRIBUTING.md

@@ -3,6 +3,7 @@
 ### Prerequisites
 
 - [Git](https://git-scm.com/)
+- [GitHub](https://github.com/)
 
 ### Types of interaction
 
@@ -17,7 +18,7 @@ If you are a user, please add your name and details in USERS.cff
 
 You can give ideas, hints or report bugs in issues, in PR, at meetings or other channels. 
 This is no development but can be considered a notable contribution. 
-If you wish, add your name and details to CITATION.cff
+If you wish, add your name and details to `CITATION.cff`.
 
 #### C. Contribute and Review
 
@@ -49,10 +50,12 @@ Make a checklist for all needed steps.
 
 ##### 2.0. Get the latest version of the `develop` branch
 
+Load the `develop branch`:
 ```bash
 git checkout develop
 ```
 
+Update with the latest version:
 ```bash
 git pull
 ```