Propose an initial set of issue templates (#621)

* Propose an initial set of issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Bug reports help improve the product quality.
+title: BUG-
+labels: "\U0001F4A5Malfunction"
+assignees: ''
+
+---
+
+**Description**
+A complete and clear description of the problem.
+
+**How to reproduce**
+
+- A code fragment
+    ```
+    from taipy import ...
+    ```
+
+- And/or configuration files or code:
+    ```
+    from taipy import Config;
+
+
+    Config.configure_data_node(...)
+    ...
+    ```
+
+- And/or Taipy GUI Markdown or HTML files
+
+**Expected behavior**
+Description of what would be the expected outcome.
+
+**Screenshots**
+When available and relevant, screenshots to better highlight the problem.
+
+**Runtime environment**
+Please specify relevant indications.
+ - Taipy version (or branch name):
+ - OS: [e.g. Linux, Windows] and version
+ - Browser: [e.g. Chrome, Edge, Safari] and version (if relevant)
+and any other relevant information.
+
+**Acceptance Criteria**
+- [ ] Ensure new code is unit tested, and check code coverage is at least 90%
+- [ ] Create related issue in taipy-doc for documentation and Release Notes if relevant
+

.github/ISSUE_TEMPLATE/feature-improvement.md

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+---
+name: Feature improvement
+about: Feature improvements add extra functionality to an existing feature.
+title: ''
+labels: "\U0001F4C8 Improvement"
+assignees: ''
+
+---
+
+**Description**
+What this improvement addresses (performance, API...).
+
+**Acceptance Criteria**
+- [ ] Ensure new code is unit tested, and check code coverage is at least 90%
+- [ ] Propagate any change on the demos and run all of them to ensure there is no breaking change
+- [ ] Ensure any change is well documented

.github/ISSUE_TEMPLATE/new-feature.md

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+---
+name: New feature
+about: Suggest a new feature for the product.
+title: ''
+labels: "✨New feature"
+assignees: ''
+
+---
+
+**What would that feature address**
+Description of the lacking functionality that this issue would address.
+Ex: It is not possible to do this or that...
+
+***Description of the ideal solution***
+What would be the best way to provide that functionality
+
+***Caveats***
+What impact could that feature have on the rest of the product, and should be taken special care of?
+
+***Other options***
+What else could we do (workaround, third-party...)?
+
+**Acceptance Criteria**
+- [ ] Ensure new code is unit tested, and check code coverage is at least 90%
+- [ ] Create related issue in taipy-doc for documentation and Release Notes
+- [ ] Check if a new demo could be provided based on this, or if legacy demos could be benefit from it
+- [ ] Ensure any change is well documented