Introduce initial issue templates

Author: asoplata

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG] "
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior. If bug is in GUI, please describe the steps. If the bug is an error with the API, then **please include a script that reproduces the bug** when possible.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Installation (please complete the following information):**
+ - OS: [e.g. macOS]
+ - Python Version [e.g. 3.14]
+ - HNN-Core version [e.g. v0.5.0]
+
+**Additional context**
+Add any other context about the problem here.
+
+**Code of Conduct**
+Please abide by our [Code of Conduct, which can be found here](https://github.com/jonescompneurolab/hnn-core/blob/master/CODE_OF_CONDUCT.md). Failure to do so will result in the consequences explained in that document.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEAT] Request: "
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Have you checked that desired feature is not already in development?**
+Please [review our standing Issues here](https://github.com/jonescompneurolab/hnn-core/issues) to ensure that this is not a duplicate of a pre-existing feature request.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.
+
+**Code of Conduct**
+Please abide by our [Code of Conduct, which can be found here](https://github.com/jonescompneurolab/hnn-core/blob/master/CODE_OF_CONDUCT.md). Failure to do so will result in the consequences explained in that document.