updated readme

Author: jpmvferreira

README.md

@@ -196,7 +196,9 @@ Therefore, I decided to make my own version of TMSU, with ~~blackjack~~ smaller
 
 # Contributing
 
-This is a small program developed by somebody who is not an experienced programmer. If you have any comments, feedback, suggestions or even feature requests, don't hesitate in opening a ticket or a discussion in this repository.
+This is a small program developed by somebody who is not an experienced programmer. If you have any comments, feedback, suggestions or even feature requests, feel free to open a ticket or a discussion in this repository.
+
+If you'd like to contribute code, first open up an issue with your proposed changes. All of the code (filesystem and CLI) are implemented in the [stagfs](./stagfs) Python script. To modify this program you need basic understanding of Python, FUSE, and SQL.
 
 # Disclaimer