Add org profile, community health defaults and reusable .NET workflows

.gitattributes

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+* text=auto eol=lf

.github/ISSUE_TEMPLATE/bug.yml

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+name: Bug report
+description: Something does not work as documented.
+labels:
+  - bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for the report. Security issues must not be filed here — use the repository's **Security** tab → **Report a vulnerability**.
+  - type: input
+    id: package
+    attributes:
+      label: Package and version
+      placeholder: DragoAnt.Example 1.2.3
+    validations:
+      required: true
+  - type: input
+    id: runtime
+    attributes:
+      label: Target framework and OS
+      placeholder: net9.0 on Ubuntu 24.04
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Minimal reproduction
+      description: The smallest code, input and configuration that shows the problem.
+      render: csharp
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected result
+    validations:
+      required: true
+  - type: textarea
+    id: actual
+    attributes:
+      label: Actual result
+      description: Include the full exception and stack trace, if any.
+    validations:
+      required: true
+  - type: textarea
+    id: notes
+    attributes:
+      label: Anything else
+      description: Workarounds you found, the last version that worked, links.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Report a security vulnerability
+    url: https://github.com/DragoAnt/.github/blob/main/SECURITY.md
+    about: Report vulnerabilities privately through the repository's Security tab, never in a public issue.
+  - name: Getting help
+    url: https://github.com/DragoAnt/.github/blob/main/SUPPORT.md
+    about: Where to ask questions and what to include.

.github/ISSUE_TEMPLATE/feature.yml

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+name: Feature request
+description: Suggest a new capability or an improvement.
+labels:
+  - enhancement
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What are you trying to do, and what gets in the way today?
+    validations:
+      required: true
+  - type: textarea
+    id: proposal
+    attributes:
+      label: Proposed solution
+      description: The API or behavior you have in mind. A code sample of the intended usage helps most.
+      render: csharp
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives considered
+  - type: checkboxes
+    id: contribute
+    attributes:
+      label: Contribution
+      options:
+        - label: I am willing to open a pull request for this.

.github/dependabot.yml

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+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      actions:
+        patterns:
+          - actions/*
+          - NuGet/*
+          - rhysd/*

.github/pull_request_template.md

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+## What and why
+
+<!-- One or two sentences. Link the issue: "Fixes #123". -->
+
+## How it was tested
+
+<!-- Tests added or changed; commands you ran. -->
+
+## Checklist
+
+- [ ] Tests cover the change (a regression test for a bug fix).
+- [ ] The README / package README is updated if usage changed.
+- [ ] No breaking change, or the breaking change is described above.

.github/workflows/actionlint.yml

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+name: actionlint
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: actionlint-${{ github.ref }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+jobs:
+  actionlint:
+    name: Lint workflows
+    runs-on: ubuntu-24.04
+    timeout-minutes: 5
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: actionlint
+        uses: docker://rhysd/actionlint@sha256:b1934ee5f1c509618f2508e6eb47ee0d3520686341fec936f3b79331f9315667 # 1.7.12
+        with:
+          args: -color .github/workflows/actionlint.yml .github/workflows/dotnet-build.yml workflow-templates/dotnet-ci.yml workflow-templates/dotnet-release.yml