[Feature] Add issue template (#540)

.github/workflows/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report a bug
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please fill out the sections below to help everyone identify and fix the bug
+  - type: textarea
+    id: description
+    attributes:
+      label: Short description
+      placeholder: Describe here
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: What is the expected result?
+      placeholder: Describe here
+  - type: textarea
+    id: actual
+    attributes:
+      label: What is the actual result?
+      placeholder: Describe here
+  - type: textarea
+    id: code_bug
+    attributes:
+      label: Steps/Code to reproduce
+      placeholder: |
+        from qadence import *
+    validations:
+      required: true
+  - type: textarea
+    id: texterror
+    attributes:
+      label: Tracebacks (optional)
+  - type: textarea
+    id: textenv
+    attributes:
+      label: Environment details (optional)
+      placeholder: Qadence version, Operating  system, Python version, PyTorch version
+  - type: dropdown
+    id: assign
+    attributes:
+      label: "Would you like to work on this issue?"
+      options:
+        - "Yes"
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting this issue! We will get back to you as soon as possible.

.github/workflows/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Contribution guidelines
+    url: https://pasqal-io.github.io/qadence/latest/getting_started/CONTRIBUTING/
+    about: How to contribute

.github/workflows/ISSUE_TEMPLATE/new-feature.yml

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+name: New feature
+description: Suggest or request a new feature
+labels: ["feature"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please fill out the sections below to properly describe the new feature you are suggesting.
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature
+      placeholder: I want ...
+    validations:
+      required: true
+  - type: textarea
+    id: rationale
+    attributes:
+      label: It should be implemented because
+      placeholder: It will allow ...
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      placeholder: |
+        Add any other context or screenshots about the feature request here.
+  - type: dropdown
+    id: assign
+    attributes:
+      label: "Would you like to work on this issue?"
+      options:
+        - "Yes"
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your suggestion! Let's see together if it can be implemented.