Update README.md

Information about forks

Author: swsms

README.md

@@ -12,3 +12,5 @@ The **Issues** tab is used to discuss ideas, enhancements, bugs, questions, and
 The **Pull requests** tab contains proposals to make some changes in the files located in the repository. Repo's owners may review a request and put your changes if they look good.
 
 You can create an *Issue* or make a *Pull request (PR)* to contribute to the project.
+
+If you want to propose some changes to this repo, you may *fork* it, modify the content, and create *PR*. A *fork* is just a copy that allows you to change the content without affection the original project.