Add .vscode to .gitignore

Brings this repo in line with other core repos

Author: davwheat

.gitignore

@@ -7,3 +7,4 @@ docs/it/extend/update-b14.md
 docs/it/extend/update-b13.md
 docs/it/extend/update-b12.md
 docs/it/extend/update-b10.md
+.vscode