Update issue templates

.github/ISSUE_TEMPLATE/issue-template.md

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+---
+name: Issue template
+about: Use this option to report an issue in mediasoup-demo
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**IMPORTANT:** We primarily use GitHub as an issue tracker. Just open an issue here if you have encountered a real bug in the mediasoup-demo project.
+
+If you have questions or doubts about mediasoup or about the mediasoup-demo project, or need support, please use the mediasoup Discourse Group instead:
+> 
+> https://mediasoup.discourse.group
+
+**TO BE CLEAR:** Don't open an issue here to ask questions about mediasoup or mediasoup-demo.