Add 3 issue templates (workshop instance, bug, content improvement).

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Report a problem
+description: Tell us about something that needs to be fixed
+body:
+  - type: textarea
+    id: details
+    attributes:
+      label: What is the problem?
+      description: Please provide details, to make it easier for the maintainers and other community members to address the issue.
+    validations:
+      required: true
+  - type: input
+    id: location
+    attributes:
+      label: Location of problem (optional)
+      description: Where is the problem that needs to be fixed? (e.g. the name of the source file or the URL(s) of the webpage(s))
+  - type: markdown
+    attributes:
+      value: >
+        Thank you for taking time to tell us about a problem in this lesson!

.github/ISSUE_TEMPLATE/content_improvement.yml

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+name: Suggest a curriculum-wide or specific episode improvement
+description: Tell us about how the content of the curriculum as a whole could be improved
+body:
+  - type: textarea
+    id: details
+    attributes:
+      label: How could the content be improved?
+      description: Please provide details of the improvement you are suggesting, to make it easier for the maintainers and other community members to address the issue.
+    validations:
+      required: true
+  - type: input
+    id: location-details
+    attributes:
+      label: Which part of the content or episode does your suggestion apply to (unless it is curriculum-wide improvement)?
+      description: Please provide a URL, the title of the relevant section or page, a filename, etc.
+  - type: markdown
+    attributes:
+      value: >
+        Thank you for taking time to suggest an improvement to this lesson!

.github/ISSUE_TEMPLATE/workshop_details.yml

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+name: Workshop Details and Feedback
+description: Share details, number of participants and feedback from a workshop that you are planning to deliver or have delivered recently.
+title: "[Workshop details and feedback]: "
+labels: ["type:discussion"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for planning to teach or teaching this lesson and agreeing to share feedback!
+        Please answer the questions below,
+        and note that feedback submitted with this form will be publicly visible.
+        If you do not have any feedback to share at the moment (e.g. you have not delivered the workshop yet) -
+        you can come back to this issue later and fill in the missing details.
+  - type: textarea
+    id: workshop
+    attributes:
+      label: 1. Workshop details
+      description: |
+        Tell us about the workshop.
+        When and where is it taking place/did it take place? Who will host/hosted it? Who were the Instructors?
+        How many Learners were there? What was/is background of the Learners, e.g. their career stage, domain, prior knowledge of the lesson topics?
+    validations:
+      required: true
+  - type: markdown
+    attributes:
+      value: |
+        ## Instructor Feedback
+  - type: textarea
+    id: instructor-up
+    attributes:
+      label: 2. What did the Instructors find worked well when teaching the lesson?
+      description: |
+        What was good about the content and/or the design of the lesson?
+    validations:
+      required: true
+  - type: textarea
+    id: instructor-down
+    attributes:
+      label: 3. What did the Instructors find that could be improved in the lesson?
+    validations:
+      required: true
+  - type: textarea
+    id: instructor-other
+    attributes:
+      label: 4. Do the Instructors have any other feedback on the lesson?
+  - type: dropdown
+    id: time
+    attributes:
+      label: 5. Were the Instructors able to teach the whole lesson in the time available?
+      options:
+        - "Not sure"
+        - "Yes"
+        - "No"
+    validations:
+      required: true
+  - type: textarea
+    id: time-details
+    attributes:
+      label: 6. Tell us more about the lesson duration
+      description: |
+        If the Instructors were not able to teach the complete lesson in the time available, how much time did they have and how far through the lesson did they get?
+        What content, if any, did they skip when teaching the lesson?
+        If they were able to teach the whole lesson, how much time did it take?
+        If an episode-by-episode breakdown of the time taken was recorded, please share it here.
+  - type: markdown
+    attributes:
+      value: |
+        ## Learner Feedback
+  - type: textarea
+    id: learner-feedback
+    attributes:
+      label: 7. Please share any feedback collected from Learners during the lesson pilot.
+      description: |
+        Feel free to exclude any feedback that is specific to the Instructors, venue, etc, or about other lessons taught at the workshop.
+  - type: markdown
+    attributes:
+      value: |
+        ## Conclusion
+  - type: textarea
+    id: other
+    attributes:
+      label: 8. Is there anything else you would like to tell us?