.gitignore: add vscode debugger files to gitignore

Adds directory .vscode and file __debug_bin to the ignore file.
These files are necessary to run the the vscode debugger.

Change-Id: I23a6cf9e3846bcca160cf668a832d1289e1e0cac
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/257660
Reviewed-by: Jonathan Amsterdam <jba@google.com>
Trust: Jamal Carvalho <jamal@golang.org>
diff --git a/.gitignore b/.gitignore
index 0d33d6c..f2b401b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,7 @@
 
 #### Loadtest Related Files ####
 results.bin
+
+#### VS Code Debugger Files ####
+.vscode
+__debug_bin