Adding issue templates

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Darkmatter X Community
+    url: https://twitter.com/i/communities/1727990925480079392
+    about: Please ask and answer usage-related questions here.

.github/ISSUE_TEMPLATE/issue_bug.md

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+---
+name: Bug report
+about: Our code behaves incorrectly?
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+<!--
+**Double-check**
+
+* Is this *really* a bug?
+  - If the behavior is documented, but you disagree with it, please do file an issue, but as a "Design consideration," not a "Bug report."
+  - If you don't understand why something behaves the way it does, consider asking on [Discussions](https://github.com/darkmatter-lang/darkmatter/discussions).
+* Is the problem not in some third-party library, not in [Darkmatter](https://github.com/darkmatter-lang/darkmatter/issues)?
+  - Example: you write for Android, and your code works properly on most devices, but for a couple of them, it fails. Then please direct this to Google and/or the manufacturer of your device.
+* Maybe you're using some ancient version, and the problem doesn't happen with the latest releases of the compiler and the library?
+-->
+
+**Describe the bug**
+
+What happened? What should have happened instead?
+
+**Provide a Reproducer**
+
+* If possible, please provide a small self-contained project (or even just a single file) where the issue reproduces.
+* If you can't pinpoint the issue, please provide at least *some* project where this reproduces, for example, your production one. If you are not ready to show the project publicly, we are open to discussing the details privately.
+* If you really can't provide any code, please do still open an issue. This may prompt other people to chime in with their reproducers.