Create issue_template.md

Author: miniwolf

issue_template.md

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+Your issue may already be reported!
+Please search on the [issue track](https://github.com/Unity-Technologies/vscode-unity-debug/issues) before creating one.
+
+## Expected Behavior
+If you're describing a bug, tell us what should happen
+If you're suggesting a change/improvement, tell us how it should work
+
+## Current Behavior
+If describing a bug, tell us what happens instead of the expected behavior
+If suggesting a change/improvement, explain the difference from current behavior
+
+## Possible Solution
+Not obligatory, but suggest a fix/reason for the bug,
+or ideas how to implement the addition or change
+
+## Steps to Reproduce (for bugs)
+Provide a link to a live example, or an unambiguous set of steps to
+reproduce this bug. Include code to reproduce, if relevant
+1.
+2.
+3.
+4.
+
+## Context
+How has this issue affected you? What are you trying to accomplish?
+Providing context helps us come up with a solution that is most useful in the real world
+
+## Your Environment
+* VS Code Version used:
+* Version of the debugger tool:
+* Operating System and version:
+* Any additional information you think could help