refactor: add .editorconfig and refactor code

Security/Services/PasswordHashService.cs

@@ -34,8 +34,8 @@ public class PasswordHashService
         if (a.Length != b.Length)
             return false;
 
-        int result = 0;
-        for (int i = 0; i < a.Length; i++)
+        var result = 0;
+        for (var i = 0; i < a.Length; i++)
             result |= a[i] ^ b[i];
         return result == 0;
     }