chore: Add issue templates (#21)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug in Nada DSL
+---
+
+<!--
+This issue tracker is a tool to address bugs in Nada DSL itself. Please use
+Github Discussions for questions about your own code.
+
+Replace this comment with a clear outline of what the bug is.
+-->
+
+<!--
+Describe how to replicate the bug.
+
+Include a minimal reproducible example that demonstrates the bug.
+Include the full traceback if there was an exception.
+-->
+
+<!--
+Describe the expected behavior that should have happened but didn't.
+-->
+
+Environment:
+
+- Python version:
+- Nada DSL version:

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Questions
+    url: https://github.com/orgs/NillionNetwork/discussions
+    about: Ask questions about your own code on the Nillion Discussions tab.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a new feature for Nada DSL
+---
+
+<!--
+Replace this comment with a description of what the feature should do.
+Include details such as links to relevant specs or previous discussions.
+-->
+
+<!--
+Replace this comment with an example of the problem which this feature
+would resolve. Is this problem solvable without changes to Nada DSL, such
+as by subclassing or using an extension?
+-->