Remove appveyor build and use github CI action instead

Close #15

.github/dependabot.yml

@@ -0,0 +1,13 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://help.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+
+ # Maintain dependencies for GitHub Actions
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/CI_build.yml

@@ -0,0 +1,44 @@
+name: CI_build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        build_configuration: [Release, Debug]
+        build_platform: [x64, Win32, ARM64]
+
+    steps:
+    - name: Checkout repo
+      uses: actions/checkout@v4
+
+    - name: Add msbuild to PATH
+      uses: microsoft/setup-msbuild@v1
+
+    - name: MSBuild of plugin dll
+      working-directory: vs.proj\
+      run: msbuild NppPluginConverter.vcxproj /m /p:configuration="${{ matrix.build_configuration }}" /p:platform="${{ matrix.build_platform }}"
+
+    - name: Archive artifacts for x64
+      if: matrix.build_platform == 'x64' && matrix.build_configuration == 'Release'
+      uses: actions/upload-artifact@v3
+      with:
+          name: plugin_dll_x64
+          path: bin64\NppConverter.dll
+
+    - name: Archive artifacts for Win32
+      if: matrix.build_platform == 'Win32' && matrix.build_configuration == 'Release'
+      uses: actions/upload-artifact@v3
+      with:
+          name: plugin_dll_x86
+          path: bin\NppConverter.dll
+
+    - name: Archive artifacts for ARM64
+      if: matrix.build_platform == 'ARM64' && matrix.build_configuration == 'Release'
+      uses: actions/upload-artifact@v3
+      with:
+          name: plugin_dll_arm64
+          path: arm64\NppConverter.dll