Add presubmit check for oppressive language

BUG=b:162024466
TEST=try uploading a CL with one of the blocked terms in it

Change-Id: I6444ee5da5edc6999bbe1cb252e78051d704d800
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/touchpad-tests/+/2463468
Tested-by: Harry Cutts <hcutts@chromium.org>
Auto-Submit: Harry Cutts <hcutts@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>
diff --git a/unblocked_terms.txt b/unblocked_terms.txt
new file mode 100644
index 0000000..dfb76b4
--- /dev/null
+++ b/unblocked_terms.txt
@@ -0,0 +1,36 @@
+# Don't delete this file if you want to keep keyword_check enabled even if it's
+# empty.
+#
+# See repohooks/README.md for more details.
+
+# black.?hat
+# black.?list
+build.?cop
+crazy
+cripple
+dummy
+# first.?class.?citizen
+# grandfathered
+# gr[ae]y.?hat
+# gr[ae]y.?list
+insane
+\bhe\b
+\bshe\b
+\bhim\b
+\bher\b
+\bhis\b
+\bhers\b
+man.?in.?the.?middle
+# master
+mitm
+native
+red.?line
+rtfm
+sane
+sanity
+# slave
+# white.?glove
+# white.?hat
+white.?label
+# white.?list
+wtf