chore(github): add issue templates

.github/ISSUE_TEMPLATE/BUG_REPORT.yml

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+name: Bug Report
+description: Report a problem and help us fix it.
+labels: ["bug"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+    validations:
+      required: true
+  - type: textarea
+    id: steps-reproduction
+    attributes:
+      label: Steps to reproduce
+      description: Clear steps that allow us to reproduce the error.
+      value: |
+             1. do this
+             2. do that
+             3. now this happens
+    validations:
+      required: true
+  - type: textarea
+    id: expected-behavior
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen. 
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Environment
+      description: 'The environment on which this error was observed. Hint: you may use the "Provide feedback" button in the bottom-right corner of the Camunda Modeler to copy environment info directly to your clipboard!'
+      value: |
+             - OS: [e.g. MacOS 10.2, Windows 10]
+             - Camunda Modeler Version: [e.g. 2.0.0]
+             - Execution Platform: [e.g. Camunda 7, Camunda 8]
+             - Installed plug-ins: [...]
+    validations:
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes:
+      label: Additional context
+      description: Anything else that might help us to evaluate the error.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.yml

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+name: Feature request
+description: Suggest an idea or general improvement.
+labels: ["enhancement"]
+body: 
+  - type: textarea
+    id: problem-description
+    attributes: 
+      description: A clear and concise description of what the problem is.
+      label: Problem you would like to solve
+      placeholder: 'Example: I am always frustrated when [...]'
+    validations: 
+      required: true
+  - type: textarea
+    id: solution-proposed
+    attributes: 
+      description: Describe the solution you would like to see implemented.
+      label: Proposed solution
+    validations: 
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes: 
+      description: "A clear and concise description of any alternative solutions or features you've considered."
+      label: "Alternatives considered"
+    validations: 
+      required: true
+  - type: textarea
+    id: additional-context
+    attributes: 
+      description: "Add any other context or screenshots about the feature request here. For example, provide the execution platform you are operating on (Camunda 7, Camunda 8, ...)."
+      label: "Additional context"
+    validations: 
+      required: false

.github/ISSUE_TEMPLATE/TASK.yml

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+name: Task
+description: Describe a generic activity we should carry out.
+body:
+  - type: textarea
+    id: what
+    attributes:
+      label: What should we do?
+      description: Clearly describe the activity we should carry out.
+    validations:
+      required: true
+  - type: textarea
+    id: why
+    attributes:
+      label: Why should we do it?
+      description: Argue why doing it is a healthy investment of our time.
+    validations:
+      required: true

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask a question
+    url: https://forum.camunda.io/c/camunda-platform-8-topics
+    about: Head over to our community forum to ask questions and get answers.