Update Readme.md

Slight typo here (:

Documentation/Readme.md

@@ -52,7 +52,7 @@ here: https://www.imagemagick.org/script/porting.php.
 ## OpenMP
 
 Magick.NET no longer uses OpenMP because the C++ Redistributable is statically linked. OpenMP is used to perform multithreaded operation on 
-an image to increase the perforance. The best use case for this would be a standalone applicatiom. Starting with Magick.NET 7.0.7.700 there
+an image to increase the performance. The best use case for this would be a standalone applicatiom. Starting with Magick.NET 7.0.7.700 there
 are extra packages for the x64 build of Magick.NET that has OpenMP support. This version requires you to install the
 [Microsoft Visual C++ Redistributable for Visual Studio 2017](https://go.microsoft.com/fwlink/?LinkId=746572) on the machine that runs the
 application.
@@ -142,4 +142,4 @@ can be found here: [Magick.NET.Web](Magick.NET.Web.md).
 
 ## More documentation
 For some great ImageMagick examples please visit the following page: https://www.imagemagick.org/Usage. Create a [new issue](https://github.com/dlemstra/Magick.NET/issues)
-if you need help to change one of these examples into code.
+if you need help to change one of these examples into code.