Update README.md

Add sponsor title

Author: cr0hn

README.md

@@ -12,6 +12,10 @@ Code | https://github.com/cr0hn/vulnerable-node
 Issues | https://github.com/cr0hn/vulnerable-node/issues/
 Author | Daniel Garcia (cr0hn) - @ggdaniel
 
+# Support this project
+
+Support this project (to solve issues, new features...) by applying the Github "Sponsor" button.
+
 # What's this project?
 
 The goal of this project is to be a project with really vulnerable code in NodeJS, not simulated.