Add contact to project introduction

docs/source/introduction/project.md

@@ -26,3 +26,7 @@ We hope to have learned from that mistake.
 That is why we have made a proper documentation (the one you are reading right now!) and decent, working foundation of the system.
 We have also made an effort to document the code as much as possible.
 We hope you continue on our efforts if you choose this project.
+
+## Contact us
+
+If you have any questions about the project, our system or anything, feel free to [contact](../contact.md) any of us.