Remove duplicate text

Co-Authored-By: artiume <siderite@gmail.com>

README.md

@@ -70,7 +70,7 @@ These instructions will help you get set up with a local development environment
 
 ### Prerequisites
 
-Before the the project can be built, you must first install the [.NET Core 3.1 SDK](https://dotnet.microsoft.com/download) on your system.
+Before the project can be built, you must first install the [.NET Core 3.1 SDK](https://dotnet.microsoft.com/download) on your system.
 
 Instructions to run this project from the command line are included here, but you will also need to install an IDE if you want to debug the server while it is running. Any IDE that supports .NET Core development will work, but explicit instructions for [Visual Studio](https://visualstudio.microsoft.com/downloads/) (at least 2017) and [Visual Studio Code](https://code.visualstudio.com/Download) are included here.