Add Issue and Pull Request templates, mainly for ADRs

.github/ISSUE_TEMPLATE/action_item.md

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+---
+name: Action Item
+about: Use this template for creating work to be done, usually in relation to a GitHub Discussion
+---
+
+**GitHub Discussion:** # / NA
+
+**Work Summary**:
+<!-- These are some suggestions to get you started, but feel free to write your own from scratch -->
+In the GitHub Discussion, we concluded that...
+
+As a result, we need to...
+
+Completing this work will mean...
+
+**Do you think this work might require an [Architectural Decision Record (ADR)](https://github.com/json-schema-org/community/blob/main/CONTRIBUTING.md#key-architectural-decisions)? (significant or noteworthy)**
+
+Yes/No
+[JUSTIFICATION]
+
+**Work Detail**:
+<!-- Each item in this list may be a single Pull Request or a single PR may cover multiple  -->
+- [ ] List of work
+- [ ] To be done
+
+**Any further requirements to resolve this issue**

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  # - name: Ask a question
+  #   url: ./../../discussions
+  #   about: Please report security vulnerabilities here.
+  - name: JSON Schema Slack
+    url: https://json-schema.org/slack
+    about: Get async support and discussion from the community and maintainers

.github/issue_template.md

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+---
+name: General Issue
+about: Use this template for creating general issues
+---
+
+<!-- If you're unsure if this issue clearly results in action, consider starting a Discussion first. -->
+<!-- If you have a question, please start a Discussion rather than raising an issue. -->
+**GitHub Discussion:** # / NA
+
+**Summary**:
+
+**Do you think resolving this issue might require an [Architectural Decision Record (ADR)](https://github.com/json-schema-org/community/blob/main/CONTRIBUTING.md#key-architectural-decisions)? (significant or noteworthy)**
+
+Yes/No
+[JUSTIFICATION]
+
+**Details**:
+
+**Required to resolve**
+<!-- Please provide context followed by a checklist -->
+[CONTEXT]
+
+- [ ] item1
+- [ ] item2
+
+
+**Any further requirements to resolve this issue**

.github/pull_request_template.md

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+
+<!-- In order to keep off topic discussion to a minimum, it helps if the "work to be done" is already agreed on. -->
+<!-- Ideally, a GitHub Issue with the label `Status: Consensus` will have been concluded, and linked to in this PR. -->
+**GitHub Issue:** # / NA
+
+**Summary**:
+
+**Do you think resolving this issue might require an [Architectural Decision Record (ADR)](https://github.com/json-schema-org/community/blob/main/CONTRIBUTING.md#key-architectural-decisions)? (significant or noteworthy)**
+<!-- If the issue has the `adr-required`, this PR must include an ADR. -->
+<!-- If you do not want to include an ADR, or are not sure how to make one, make sure you allow edits to this PR by maintainers. -->
+
+Yes/No
+[JUSTIFICATION]