Create ISSUE_TEMPLATE.md

Author: dragosct

ISSUE_TEMPLATE.md

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+<!--
+ IMPORTANT: Please use the following link to create a new issue:
+
+  https://www.creative-tim.com/new-issue/vue-argon-design-system
+
+**If your issue was not created using the app above, it will be closed immediately.**
+-->
+
+<!--
+Love Creative Tim? Do you need Angular, React, Vuejs or HTML? You can visit:
+👉  https://www.creative-tim.com/bundles
+👉  https://www.creative-tim.com
+-->