Documented the AppArguments protocol and the Environment+Properties extension in the library target.

App/Sources/AppOptions.swift

@@ -9,12 +9,12 @@ extension App {
         
         @Option(name: .shortAndLong)
         var hostname: String = "127.0.0.1"
+        
+        @Option(name: .shortAndLong)
+        var logLevel: Logger.Level?
 
         @Option(name: .shortAndLong)
         var port: Int = 8080
 
-        @Option(name: .shortAndLong)
-        var logLevel: Logger.Level?
-        
     }
 }