Update README.md

Author: jdeigendesch

README.md

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 # ASP.NET Core Example
 <h3>This is an example of a REST API with ASP.NET Core v1.0, which is made via following tutorials:</h3>
-</br>
-Channel9: Creating REST API with ASP.NET Core (german): https://www.microsoft.com/germany/techwiese/know-how/video.aspx?id=msdn_de_67138</br>
-Managing Static Files in ASP.NET Core: https://www.youtube.com/watch?v=n3rL0ekYEOM</br>
-ASP.NET Web API Help Pages using Swagger: https://docs.microsoft.com/en-us/aspnet/core/tutorials/web-api-help-pages-using-swagger</br>
+<ul>
+  <li>Channel9: Creating REST API with ASP.NET Core (german): https://www.microsoft.com/germany/techwiese/know-how/video.aspx?id=msdn_de_67138</li>
+  <li>Managing Static Files in ASP.NET Core: https://www.youtube.com/watch?v=n3rL0ekYEOM</li>
+  <li>ASP.NET Web API Help Pages using Swagger: https://docs.microsoft.com/en-us/aspnet/core/tutorials/web-api-help-pages-using-swagger</li>
+</ul>