[docs]Add a link to slack.
- [Overview](#overview)
- [Supports](#supports)
+- [Slack](https://join.slack.com/t/toppracommunity/shared_invite/zt-npyxpszp-3msp6MZhE5wNcjdrB~fWFg)
- [Citing `toppra`](#citing--toppra-)
@@ -34,6 +35,8 @@ given constraints can be found.
Please report any issues, questions or feature request via
[Github issues tracker](https://github.com/hungpham2511/toppra/issues).
+Have a quick question? Try asking in our slack channel.
+
## Contributions
Pull Requests are welcome! Create a Pull Request and we will review
your proposal!
