Add Readme

Author: inyutin-maxim

README.MD

@@ -0,0 +1,9 @@
+#Usage
+1. Add to project nuget package System.IO.Abstractions
+``` bash
+> dotnet add package System.IO.Abstractions
+```
+2. Add to project nuget package System.IO.Abstractions.Analyzers
+``` bash
+> dotnet add package System.IO.Abstractions.Analyzers
+```