Add GitHub issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug Report
+about: Report a bug
+title: ""
+labels:
+assignees: ''
+
+---
+<!-- INSTRUCTIONS
+
+Please fill in the sections below:
+* Remove the comments (like this one) before submitting your issue:
+  anything between `<! --` and `-->` is a comment and should be removed.
+* Remove the sections which are not applicable to your issue.
+
+
+If this is the first time you interact on this project, welcome to the community!
+
+In this case, please give a bit of information about yourself, and how you are using Hello ImGui (which project, how long you have been using it, etc.).
+
+Note: 
+- The author is French, so remember that saying "Hello" or "Bonjour" is a good way to get him more willing to help you! ;-)
+- Please check existing [open issues](../issues) and [discussions](../discussions) for similar reports before submitting a new one.
+
+-->
+
+
+### Describe the bug
+
+<!-- Include here a clear and concise description of what the bug is -->
+
+**Minimal reproducible example**
+<!--
+Please, please do try to provide a minimal reproducible example that reproduces the bug, either in C++ or Python.
+See:
+    https://stackoverflow.com/help/minimal-reproducible-example
+If not applicable, remove this part.
+-->
+
+For C++:
+```cpp
+// Your code here... (a compilable example, including the main function)
+```
+
+For Python:
+```python
+# Your code here... (a runnable example)
+```
+
+**To Reproduce**
+<!-- If reproducing is complex, please specify the steps here.
+Otherwise, remove this part.
+1. ...
+2. ...
+3. ...
+-->
+
+**Additional context**
+<!--
+* If applicable, please include the error message or any relevant logs.
+* Also include screenshots if relevant.
+* Add any other context about the problem here.
+Otherwise, remove this part.
+-->
+
+### Environment and configuration
+**Version**:
+- Version of Hello ImGui: Version number or commit hash and/or date
+
+**Platform**:
+- OS: [e.g., Windows 10, Linux, Mac, iOS, Android, emscripten]
+- Python or C++: [e.g., Python 3.10, C++ 17]
+<!--
+If relevant, also include:
+- Compiler (if applicable): [e.g., GCC 10.2, MSVC 2019]
+- platform backend, e.g., SDL2, GLFW
+- rendering backend, e.g., OpenGL, Vulkan, DirectX, Metal
+If this part is not relevant, remove it.
+-->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Hello ImGui Documentation
+    url: https://pthom.github.io/hello_imgui/
+    about: This is the official documentation for Hello ImGui.
+  - name: Dear ImGui Manual
+    url: https://pthom.github.io/imgui_manual_online/manual/imgui_manual.html
+    about: This is an interactive manual for Dear ImGui. Its show all the widgets and features of Dear ImGui with C++ and Python code.
+  - name: Discussions
+    url: https://github.com/pthom/hello_imgui/discussions
+    about: This is the official place to discuss about Hello ImGui.
+  - name: Dear ImGui Bundle Documentation
+    url: https://pthom.github.io/imgui_bundle/
+    about: This is the official documentation for Dear ImGui Bundle.
+  - name: Dear ImGui Bundle Interactive Manual
+    url: https://traineq.org/ImGuiBundle/emscripten/bin/demo_imgui_bundle.html
+    about: This is the official interactive demo for Dear ImGui Bundle, with lots of examples (with code)

.github/ISSUE_TEMPLATE/custom.md

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+---
+name: Custom Issue
+about: Report an issue that doesn't fit into other categories
+title: ""
+labels: ''
+assignees: ''
+
+---
+
+
+<!-- INSTRUCTIONS
+
+Please fill in the sections below:
+* Remove the comments (like this one) before submitting your issue:
+  anything between `<! --` and `-->` is a comment and should be removed.
+* Remove the sections which are not applicable to your issue.
+
+
+If this is the first time you interact on this project, welcome to the community!
+
+In this case, please give a bit of information about yourself, and how you are using Dear ImGui Bundle (which project, how long you have been using it, etc.).
+
+Note: The author is French, so remember that saying "Hello" or "Bonjour" is a good way to get him more willing to help you! ;-)
+
+-->
+
+<!--
+**Describe your issue**
+Explain why you think this feature would be useful.
+-->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature Request
+about: Suggest a new feature or improvement
+title: ""
+labels: enhancement
+assignees: ''
+
+---
+
+
+<!-- INSTRUCTIONS
+
+Please fill in the sections below:
+* Remove the comments (like this one) before submitting your issue:
+  anything between `<! --` and `-->` is a comment and should be removed.
+* Remove the sections which are not applicable to your issue.
+
+
+If this is the first time you interact on this project, welcome to the community!
+
+In this case, please give a bit of information about yourself, and how you are using Dear ImGui Bundle (which project, how long you have been using it, etc.).
+
+Note: The author is French, so remember that saying "Hello" or "Bonjour" is a good way to get him more willing to help you! ;-)
+
+-->
+
+<!--
+**Describe the feature you'd like**
+A clear and concise description of what you want to happen.
+Explain why you think this feature would be useful.
+-->