Added GitHub workflows

.github/workflows/build.yml

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+name: .NET Core
+
+on:
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+      with:
+        dotnet-version: 2.1.607
+
+    - name: Restore NuGet Packages
+      run: dotnet restore StringBuilderExtensions.sln
+
+    - name: Build with dotnet
+      run: |
+        DOTNET_CLI_TELEMETRY_OPTOUT=1
+        msbuild StringBuilderExtensions.sln /p:Configuration=Release
+
+    - name: Run Unit Tests
+      run: |
+        cd StringBuilderExtensionsTests
+        dotnet run -c Release --no-build

.github/workflows/publish_ci.yml

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+name: publish to MyGet
+
+on:
+  push:
+    branches:
+      - develop
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Setup .NET Core
+      uses: actions/setup-dotnet@v1
+    - name: Build with dotnet
+      run: |
+        sed -i "s|<Version>\(.*\)</Version>|<Version>\1-ci-$GITHUB_RUN_ID</Version>|" StringBuilderExtensions\StringBuilderExtensions.csproj
+        dotnet pack --nologo --configuration Release -o nuget
+    - name: MyGet push
+      run: |
+        source=https://www.myget.org/F/xperiandri/api/v3/index.json
+        key=${{secrets.MyGet_Key}}
+        dotnet nuget push -s $source -k $key nuget/*.nupkg

.github/workflows/publish_release.yml

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+name: publish to NuGet
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      # Required for a specific dotnet version that doesn't come with ubuntu-latest / windows-latest
+      # Visit bit.ly/2synnZl to see the list of SDKs that are pre-installed with ubuntu-latest / windows-latest
+      # - name: Setup dotnet
+      #   uses: actions/setup-dotnet@v1
+      #   with:
+      #     dotnet-version: 3.1.100
+
+      # Publish
+      - name: publish on version change
+        uses: rohith/publish-nuget@v2
+        with:
+          PROJECT_FILE_PATH: StringBuilderExtensions\StringBuilderExtensions.csproj # Relative to repository root
+          # VERSION_FILE_PATH: Directory.Build.props # Filepath with version info, relative to repository root. Defaults to project file
+          # VERSION_REGEX: <Version>(.*)<\/Version> # Regex pattern to extract version info in a capturing group
+          # TAG_COMMIT: true # Flag to enable / disalge git tagging
+          # TAG_FORMAT: v* # Format of the git tag, [*] gets replaced with version
+          NUGET_KEY: ${{secrets.NuGet_Key}}