Move CI to GitHub actions (#740)

* Remove Travis CI

* Add GitHub Actions

Author: alexandrnikitin

.github/workflows/build_and_test.yml

@@ -0,0 +1,21 @@
+name: Build and Test
+
+on: [push, pull_request]
+jobs:
+  build:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, windows-latest, macOS-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v3
+        with:
+          dotnet-version: 6.0.x
+      - name: Restore dependencies
+        run: dotnet restore
+      - name: Build
+        run: dotnet build -c Release --no-restore
+      - name: Test
+        run: dotnet test -c Release -f net6.0 --no-build --verbosity normal