Updated readme

README.md

@@ -3,9 +3,22 @@
 Android app made by TrianguloY
 
 - Play Store link: https://play.google.com/store/apps/details?id=com.trianguloy.urlchecker
+- F-Droid link: https://f-droid.org/en/packages/com.trianguloy.urlchecker/
 
-You can use parts of this project in your own ones, create pull request, or upload modified versions of it AS LONG AS you credit me.
+### Contribution
+
+All help is welcomed! Feel free to suggest changes, create issues or even pull requests (from a simple typo fix to a full new module or even more!)
+
+I don't have a coding style, but try to keep it similar to mine, with just a couple notes:
+
+- Please write comments. No need to write full paragraphs each line, but at least a minor comment for functions and non-obvious blocks of code really help.
+- Try to make small commits, when possible, I'll need to review you changes manually so help me understand it.
+
+### License
+
+You can use parts of this project in your own ones, or upload modified versions of it AS LONG AS you credit me.
 
 How to credit:
+
 - You must add my nick (TrianguloY) in an 'about' or 'acknowledgments' section visible to the user.
 - You must add a link to this GitHub main page (https://github.com/TrianguloY/UrlChecker) or subpage (if you used a part of the code or an asset) in an 'about' or 'acknowledgments' section visible to the user.