Create ISSUE_TEMPLATE.md

Author: bruno-garcia

.github/ISSUE_TEMPLATE.md

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+---
+name: 🐞 Bug Report
+about: Report a bug in this repo
+---
+
+### Environment
+
+How do you use Sentry?
+Sentry SaaS (sentry.io) or self-hosted/on-premise (which version?)
+
+Which version of the SDK?
+
+Which version of Unity?
+
+Is this happening in Unity (editor) or on a player like Android, iOS, Windows?
+
+### Steps to Reproduce
+
+1. What
+2. you
+3. did.
+
+### Expected Result
+
+What you thought would happen.
+
+### Actual Result
+
+What actually happened. Maybe a screenshot/recording? Maybe some logs?
+
+
+### Any logs or screenshots