cmd/vet/all/whitelist: add readme.txt

This was written for CL 27811,
but it got lost in the sea of new files.

Change-Id: I5c52cb23dda499b21a6bb32ed5c586779ccbc2f1
Reviewed-on: https://go-review.googlesource.com/28960
Reviewed-by: Rob Pike <r@golang.org>

diff --git a/src/cmd/vet/all/whitelist/readme.txt b/src/cmd/vet/all/whitelist/readme.txt
new file mode 100644 (file)
index 0000000..4f83757
--- /dev/null
+++ b/src/cmd/vet/all/whitelist/readme.txt
@@ -0,0 +1,4 @@
+This directory contains whitelists for vet complaints about the standard library and commands.
+They are line-based and unordered, although counts of duplicated lines matter.
+Each line matches vet's output, except that line numbers are removed to avoid churn.
+There are also os-, arch-, and bitwidth-specific whitelists.