Create action (#1)

Created an action script and a test workflow that runs on every push

.github/actions/action.yml

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+name: 'GTK for Windows'
+author: 'Yash Jain'
+description: 'This will add GTK+ in Windows Runtime Environment'
+
+runs:
+
+  using: "composite"
+
+  steps:
+
+    - name: Message for Non-Windows Users
+      if: runner.os != 'Windows'
+      shell: bash
+      env:
+        THIS_OS: ${{ runner.os }}
+      run: echo "::warning title=GTK for Windows::GTK for Windows is not supported on any operating systems other than Windows. You are attempting to use it on $THIS_OS."
+
+
+    - name: Import GTK-for-Windows-Runtime-Environment-Installer
+      uses: actions/checkout@v4
+      if: runner.os == 'Windows'
+      with:
+        repository: tschoonj/GTK-for-Windows-Runtime-Environment-Installer
+        path: _tempGTK
+        sparse-checkout: gtk-nsis-pack
+        sparse-checkout-cone-mode: false
+        clean: false
+
+    - name: Add to ENV
+      if: runner.os == 'Windows'
+      shell: powershell
+      run: |
+        $Env:PATH += "$PWD\_tempGTK\gtk-nsis-pack\bin"
+        echo "$PWD\_tempGTK\gtk-nsis-pack\bin" | Out-File -FilePath $env:GITHUB_PATH -Encoding utf8 -Append

.github/workflows/test.yml

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+name: Test GTK for Windows
+
+on:
+  push
+
+jobs:
+
+  use-GTK:
+
+    name: Use GTK to convert MD to PDF
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-2019, windows-2022]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+      - name: Checkout the actions folder
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: .github/actions
+          sparse-checkout-cone-mode: false
+
+      - name: Dowload mdPDFinator
+        uses: robinraju/release-downloader@v1.8
+        with:
+          repository: yjpictures/mdPDFinator
+          latest: true
+          fileName: mdPDFinator-Windows.exe
+
+      - name: Download sample markdown
+        run: curl ${{ vars.SAMPLE_MARKDOWN_URL }} -o sample.md
+
+      - name: Add GTK
+        uses: ./.github/actions
+
+      - name: Test it out
+        run: ./mdPDFinator-Windows sample.md -o output-${{ matrix.os }}.pdf
+
+      - name: Upload the converted PDF file
+        uses: actions/upload-artifact@v3
+        with:
+          name: test-output
+          path: output-${{ matrix.os }}.pdf
+
+  use-GTK-non-supported:
+
+    name: Test out non-supported OSs
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-latest, ubuntu-latest]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+
+      - name: Checkout the actions folder
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: .github/actions
+          sparse-checkout-cone-mode: false
+
+      - name: Add GTK
+        uses: ./.github/actions