Add github

.github/FUNDING.yml

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+github: [wieslawsoltes]

.github/stale.yml

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+# https://probot.github.io/apps/stale/
+
+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 7
+
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - pinned
+  - security
+
+# Label to use when marking an issue as stale
+staleLabel: stale
+
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: true

.github/workflows/build.yml

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+name: CI
+
+on:
+  push:
+    branches:
+    - main
+    - release/*
+  pull_request:
+    branches:
+    - main
+
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macos-latest]
+    name: Build ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+    - name: Build Release
+      run: dotnet build --configuration Release
+    - name: Test Release
+      run: dotnet test --configuration Release