Add GitHub issue and pr templates

.github/ISSUE_TEMPLATE/1-bug-report.md

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+---
+name: Bug Report
+about: You have noticed a general issue or regression, and would like to report it
+title: ''
+labels: bug
+assignees: ''
+---
+
+**Describe The Bug**
+<!-- A clear and concise description of what the bug is. -->
+
+**Steps To Reproduce**
+<!-- Steps to reproduce the behavior: -->
+1. Enable '...'
+2. Play file '....'
+3. Check logs '....'
+
+**Expected Behavior**
+<!-- A clear and concise description of what you expected to happen. -->
+
+**System (please complete the following information):**
+
+- **Platform:** [e.g. Linux, Windows]
+- **Operating System:** [e.g. Ubuntu 20.04, Debian 11]
+- **Jellyfin Version:** [e.g. 10.7.7]
+- **Jellyfin-FFmpeg Version:** [e.g. 4.4.1-2]
+- **Hardware Acceleration:** [e.g. QSV, Nvidia, VAAPI, AMD AMF]
+
+**MediaInfo**
+<!-- Paste the Media Info of the file. Please use code blocks. -->
+
+**FFmpeg Logs**
+<!-- Paste any log errors. Please use code blocks. -->
+
+**Additional Context**
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/2-technical-discussion.md

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+---
+name: Technical Discussion
+about: You want to discuss technical aspects of changes you intend to make
+title: ''
+labels: enhancement
+assignees: ''
+---
+
+<!-- Explain the change and the motivations behind it.
+
+For example, if you plan to rely on a new dependency, explain why and what
+it brings to the project.
+
+If you plan to make significant changes, go roughly over the steps you intend
+to take and how you would divide the change in PRs of a manageable size. -->

.github/ISSUE_TEMPLATE/3-meta-issue.md

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+---
+name: Meta Issue
+about: You want to track a number of other issues as part of a larger project
+title: ''
+labels: meta
+assignees: ''
+---
+
+* [ ] Issue 1 [#123]
+* [ ] Issue 2 [#456]
+* [ ] ...

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Feature Request
+    url: https://features.jellyfin.org/
+    about: Please head over to our feature request hub to vote on or submit a feature.
+  - name: Help Or Question
+    url: https://matrix.to/#/#jellyfin-troubleshooting:matrix.org
+    about: Please join the troubleshooting Matrix channel to get some help.

.github/pull_request_template.md

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+<!--
+Ensure your title is short, descriptive, and in the imperative mood (Fix X, Change Y, instead of Fixed X, Changed Y).
+For a good inspiration of what to write in commit messages and PRs please review https://chris.beams.io/posts/git-commit/ and our https://docs.jellyfin.org/general/contributing/issues.html page.
+-->
+
+**Changes**
+<!-- Describe your changes here in 1-5 sentences. -->
+
+**Issues**
+<!-- Tag any issues that this PR solves here.
+ex. Fixes # -->