feat(github): Create issue templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug Report
+about: I want to report a bug that I am facing.
+title: ''
+labels: 'bug'
+
+---
+### Describe the bug
+
+A clear and concise description of what the bug is.
+
+### To Reproduce
+
+Steps to reproduce the behavior:
+
+1. First do '...'
+2. Then do '...'
+3. Finally do '...'
+4. See error
+
+### Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+### Console / log output
+
+Add console and / or log output that shows the error and additional context.
+No screenshots of plain text please, to keep text searchable.
+
+```
+<copy & paste output to here>
+```
+
+### Environment
+
+Output of the `ort requirements` command:
+
+```
+<copy & paste output to here>
+```
+
+*Or* manually specify:
+
+* ORT version: [e.g. 22.1.0]
+* Java version: [e.g. 17]
+* OS: [e.g. Linux]
+
+*And* specify (relevant parts of) your ORT configuration (`config.yml`):
+
+```
+<copy & paste output to here>
+```
+
+### Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+- name: Discuss an Idea
+  about: Start a discussion or ask a longer question.
+  url: https://github.com/oss-review-toolkit/ort/discussions
+- name: Ask a Question
+  about: Ask a quick question or just chat with the ORT community.
+  url: http://slack.oss-review-toolkit.org/

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Proposal
+about: I want to propose to enhance existing functionality.
+title: ''
+labels: 'enhancement'
+
+---
+### What is the existing functionality and how should it be enhanced?
+
+A clear and concise description of what you propose to change and why it is an enhancement.
+
+### What is the use-case for your enhancement?
+
+A clear and concise description of which users would benefit from the enhancement.
+
+### Alternatives you have considered
+
+A clear and concise description of any alternative solutions you have considered.
+
+### Additional context
+
+Add any other context or screenshots about the enhancement proposal here.

.github/ISSUE_TEMPLATE/feature.md

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+---
+name: Feature Request
+about: I want to request a new feature that I find useful.
+title: ''
+labels: 'new feature'
+
+---
+### What is the feature you want to request?
+
+A clear and concise description of what problem the feature addresses.
+
+### Describe the solution you would like
+
+A clear and concise description of what you want to happen.
+
+### Alternatives you have considered
+
+A clear and concise description of any alternative solutions you have considered.
+
+### Additional context
+
+Add any other context or screenshots about the feature request here.