feat(github): Create issue templates

Resolves oss-review-toolkit#6540.

Signed-off-by: Sebastian Schuberth <sebastian@doubleopen.org>

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,53 @@
+---
+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

@@ -0,0 +1,7 @@
+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

@@ -0,0 +1,22 @@
+---
+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

@@ -0,0 +1,22 @@
+---
+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.