Feature/codeql (#7)

* test minimal CodeQL

* test s-a-q query

* add Tool project to pipeline

* improve build step

* add missing }

* test pl on ubuntu and with dotnet build cmdlet

* improve build step's cmdlet

* add .NET setup step

Author: aleks-ivanov

.github/workflows/codeql-analysis.yml

@@ -15,6 +15,11 @@ jobs:
         id: checkout_repo
         uses: actions/checkout@v2
 
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v1
+        with:
+          dotnet-version: 5.0.x
+
       - name: Initialize CodeQL
         id: init_codeql
         uses: github/codeql-action/init@v1