add project platform clarification

Create-Visual-Studio-2019-Project.md

@@ -15,4 +15,5 @@
 * Go to _...\raylib\projects\VS2019\bin\x64\Release.DLL_ folder and copy _raylib.dll_ to your project folder (main .cpp must be in this folder)
 
 ## Start coding
-* Go to https://www.raylib.com/examples.html and grab some code to your .cpp file
+* Go to https://www.raylib.com/examples.html and grab some code to your .cpp file
+* Set your project platform to x64 (if you build your libraries in x64)