Upgrade/v5 (#7)

Updated .NET 6, C# 10, license headers and readme. Introduced file-scoped namespaces and added multiple code improvements and tests.

Author: MrMatthewLayton

.editorconfig

@@ -0,0 +1,4 @@
+root = true
+
+[*]
+max_line_length = 140

.github/workflows/dotnet.yml

@@ -19,7 +19,7 @@ jobs:
     - name: Setup .NET
       uses: actions/setup-dotnet@v1
       with:
-        dotnet-version: 5.0.x
+        dotnet-version: 6.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build