Add issue templates for DynamicBoundsBase

Author: mewilhel

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Help us locate bugs in DynamicBoundsBase
+
+---
+
+Thanks for your interest in DynamicBoundsBase!
+
+Please read the following before posting a new bug report:
+
+If you're submitting a bug report, be sure to include as much relevant information
+as possible. In general, you should try include a minimal reproducible example,
+the output of `versioninfo()`, and the output of `using Pkg; Pkg,status()`. For
+bugs that result in error messages, please include a screenshot of the full
+console output. See https://help.github.com/articles/basic-writing-and-formatting-syntax/
+for background information  on formatting text and code on GitHub issues.
+
+Thanks for your contribution to DynamicBoundsBase!

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest how we can improve DynamicBoundsBase
+
+---
+
+Thanks for your interest in DynamicBoundsBase! You can use this Github issue to suggest new
+features or make recommendations on additional documentation for DynamicBoundsBase.
+
+**If your feature request is related to a problem, please describe the problem.**
+Ex. I can't find a way to [...]
+
+**Describe the solution you'd like**
+Provide a clear brief description of the feature you'd like.
+
+**Provide any other context you think we'd find helpful**
+
+Thanks for your contribution to DynamicBoundsBase!