feat(github): add issue template (#3)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "\U0001F41B Bug or Crash Report"
+title: "bug: "
+about: Unexpected behavior with StoneDB.
+labels: ["A-bug"]
+---
+
+**Describe the problem**
+<!-- Please describe the problem you observed. -->
+
+**Expected behavior**
+
+<!-- Expected behavior you want to see. -->
+
+**How To Reproduce**
+
+<!-- If possible, provide minimal steps to reproduce the behavior. -->
+
+**Environment**
+<!-- Please describe your environment.
+ - Server OS [e.g. Linux/MacOS/Distrib ...]
+ - StoneDB Version [e.g. 1.0.x] -->
+
+**Additional context**
+<!-- What was the impact? Add any other context about the problem here. -->
+

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "\U0001F680 Feature request"
+title: "feature: "
+about: Suggest an idea for StoneDB
+labels: ["A-feature"]
+---
+
+**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 [...] -->
+
+**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. -->
+

.github/ISSUE_TEMPLATE/general_question.md

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+---
+name: "\U0001F914 Ask a Question"
+title: "question: "
+about: Need support & not sure if this a bug? You can ask a question.
+labels: ["A-question"]
+---
+
+## General Question
+
+<!--
+
+Before asking a question, make sure you have:
+
+- Searched existing Stack Overflow questions.
+- Googled your question.
+- Searched open and closed [GitHub issues](https://github.com/stoneatom/stonedb/issues)
+- Read the documentation:
+  - [StoneDB Readme](https://github.com/stoneatom/stonedb)
+  - [StoneDB Doc](https://github.com/stoneatom/stonedb/docs)
+
+-->
+