Added bug and feature report templates

Author: VijayakumarMariappan

.github/ISSUE_TEMPLATE/1_bug_report.yml

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+name: Report a bug
+description: |
+  You have discovered a bug in our widgets that is causing your application to crash 
+  or throw an exception. It appears that a widget is buggy, or something is not functioning correctly.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for using Syncfusion widgets!
+
+        If you are looking for support, please check out our documentation, knowledge base, 
+        and feedbacks. If you are unable to find a solution, please report the bug here.
+
+          - [User Guide Documentation](https://help.syncfusion.com/flutter/introduction/overview)
+          - [Knowledge Base](https://support.syncfusion.com/kb/cross-platforms/category/79)
+          - [Feedbacks](https://stackoverflow.com/questions/tagged/flutter?sort=frequent)
+          
+        You can also contact us through the following methods.
+          - [Support portal](https://support.syncfusion.com)
+          - [Support forums](https://www.syncfusion.com/forums)
+          - [Feedback portal](https://www.syncfusion.com/feedback/flutter)
+  - type: textarea
+    attributes:
+      label: Bug description
+      description: Clearly and concisely describe the problem.
+      placeholder: |
+        A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: Kindly provide us with detailed steps to replicate the issue you are experiencing.
+      placeholder: |
+        1. ...
+        2. ...
+        3. ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Code sample
+      description: |
+        Kindly create a simplified, reproducible example that demonstrates the issue 
+        and include it within the code block delineated by backticks.
+        Note: Refrain from posting screenshots containing code.
+      value: |
+        <details open><summary>Code sample</summary>
+
+        ```dart
+        [Add your code here]
+        ```
+
+        </details>
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Screenshots or Video
+      description: |
+        Upload any screenshots or video of the bug if applicable.
+      value: |
+        <details open>
+        <summary>Screenshots / Video demonstration</summary>
+
+        [Upload media here]
+
+        </details>
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Stack Traces
+      description: |
+        If it is a runtime exception, kindly provide the stack trace from the console.
+        If the traces are too large to be uploaded to GitHub, you may upload them as a `zip` file.
+        Note: If no stack trace is available, please mention it.
+      value: |
+        <details open><summary>Stack Traces</summary>
+
+        ```dart
+        [Add the Stack Traces here]
+        ```
+
+        </details>
+    validations:
+      required: true
+  - type: dropdown
+    id: target_platforms
+    attributes:
+      label: On which target platforms have you observed this bug?
+      multiple: true
+      options:
+        - Android
+        - iOS
+        - Web
+        - Web (Android browser)
+        - Web (iOS browser)
+        - Windows
+        - macOS
+        - Linux
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Flutter Doctor output
+      description: |
+        Kindly share the complete details generated by executing the command 
+        `flutter doctor -v` in your terminal.
+      value: |
+        <details open><summary>Doctor output</summary>
+
+        ```console
+        [Add your output here]
+        ```
+
+        </details>
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/2_feature_request.yml

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+name: Feature request
+description: Propose a new idea.
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for using Syncfusion widgets!
+
+        If you are looking for support, please check out our documentation, knowledge base, 
+        and feedbacks. If you are unable to find a solution, please report the bug here.
+
+          - [User Guide Documentation](https://help.syncfusion.com/flutter/introduction/overview)
+          - [Knowledge Base](https://support.syncfusion.com/kb/cross-platforms/category/79)
+          - [Feedbacks](https://stackoverflow.com/questions/tagged/flutter?sort=frequent)
+          
+        You can also contact us through the following methods.
+          - [Support portal](https://support.syncfusion.com)
+          - [Support forums](https://www.syncfusion.com/forums)
+          - [Feedback portal](https://www.syncfusion.com/feedback/flutter)
+  - type: textarea
+    attributes:
+      label: Use case
+      description: |
+        Kindly inform us of the issue you're encountering which has prompted you to suggest a new feature.
+        If your proposed feature is based on an existing problem, 
+        could you please provide a detailed and concise explanation of the issue?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Proposal
+      description: |
+        Please provide a concise and precise description of your proposal.
+
+        Include a visual representation of your concept.
+         * code samples
+         * images (illustrations, diagrams, screenshots)
+         * videos
+    validations:
+      required: true