Update ISSUE_TEMPLATE.md

.github/ISSUE_TEMPLATE.md

@@ -9,6 +9,8 @@ assignees: ''
 
 Please consider posting on [TTS Discourse](https://discourse.mozilla.org/c/tts) page, if your issue is not directly related to TTS development process.
 
+You can also check https://github.com/mozilla/TTS/wiki/FAQ for common questions and answers.
+
 Happy posting!
 
 https://discourse.mozilla.org/c/tts