Add project files.

.editorconfig

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+[*.cs]
+
+# CS8603: Possible null reference return.
+dotnet_diagnostic.CS8603.severity = none
+
+# CS8601: Possible null reference assignment.
+dotnet_diagnostic.CS8601.severity = none
+
+# CS8604: Possible null reference argument.
+dotnet_diagnostic.CS8604.severity = none
+
+# CS8602: Dereference of a possibly null reference.
+dotnet_diagnostic.CS8602.severity = none
+
+# CS8600: Converting null literal or possible null value to non-nullable type.
+dotnet_diagnostic.CS8600.severity = none
+
+# CS8618: Non-nullable field must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring as nullable.
+dotnet_diagnostic.CS8618.severity = none
+
+# IDE1006: Naming Styles
+dotnet_diagnostic.IDE1006.severity = none