Update issue templates

Author: mrchief

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please include steps to reproduce the behavior;
+or an URL to Reproduction repository; 
+or a CodeSandbox (you can fork [this](https://codesandbox.io/s/842m620yv0) one)
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - Browser [e.g. chrome v60.12.0, safari 10.1]
+ - OS: [e.g. iOS, Windows x64] (if applicable)
+ - node version (if applicable)
+ - yarn or npm version (if applicable)
+
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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/question-issue-template.md

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+---
+name: Question issue template
+about: If you have a question about the component
+
+---
+
+If you have a general query about the usage of react-dropdown-tree-select, or if you're not sure how to accomplish a particular task using the component; please raise a question on [stackoverflow.com](https://stackoverflow.com) with [react-dropdown-tree-select](https://stackoverflow.com/questions/tagged/react-dropdown-tree-select) tag.
+
+If you think you found a bug or have a feature request, please use the `Bug Report`/`Feature request` template respectively.

.github/ISSUE_TEMPLATE/question-or-general-inquiry.md

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+---
+name: Question or general inquiry
+about: If you have a question about the component
+
+---
+
+If you have a general query about the usage of react-dropdown-tree-select, or if you're not sure how to accomplish a particular task using the component; please raise a question on [stackoverflow.com](https://stackoverflow.com) with [react-dropdown-tree-select](https://stackoverflow.com/questions/tagged/react-dropdown-tree-select) tag.
+
+If you think you found a bug or have a feature request, please use the `Bug Report`/`Feature request` template respectively.