[gitignore]: Add VSCode ignore file

Change-Id: I46438925d03ed36f41feecece69a669329d08fdb
Signed-off-by: Herman Chen <herman.chen@rock-chips.com>

.gitignore

@@ -83,3 +83,9 @@ Build
 #
 /obj-arm-linux-gnueabihf/
 /obj-aarch64-linux-gnu/
+
+#
+# VSCode
+#
+.vscode/
+.code-workspace