Update UnrealEngine.gitignore

Unreal Engine supports project file generation for VSCode.
Enhance Unreal ignore file for VSCode accordingly.

UnrealEngine.gitignore

@@ -1,6 +1,9 @@
 # Visual Studio 2015 user specific files
 .vs/
 
+# VS Code workspace settings folder for generated C/C++ settings and commands
+.vscode/
+
 # Compiled Object files
 *.slo
 *.lo
@@ -34,6 +37,7 @@
 # These project files can be generated by the engine
 *.xcodeproj
 *.xcworkspace
+*.code-workspace
 *.sln
 *.suo
 *.opensdf