Add issue template for github (#602)

.github/ISSUE_TEMPLATE/ISSUE_TEMPLATE.md

@@ -0,0 +1,22 @@
+---
+name: File an issue
+about: Create a new issue for Ark.
+---
+
+<!--
+
+Thanks for taking the time to file an issue!
+
+While Ark aims to be a multi-IDE project, its main target is the Positron IDE (https://github.com/posit-dev/positron) and we coordinate all bug reports and feature requests relevant for Positron in its Github issues page. Please consider posting your issue at https://github.com/posit-dev/positron/issues.
+
+Examples of issues that should be posted to the Ark repository:
+
+- Internal tasks and refactoring.
+- Issues and feature requests that only concern Jupyter applications and that do not affect Positron.
+
+Examples of issues that should be posted to the Positron repository:
+
+- Issues and feature requests to components of Ark that directly affect the experience in Positron, such as LSP support.
+- RStudio API support.
+
+-->