x/text: add go.mod and go.sum files

Change-Id: I13075dd928617bd81ca519d29984fbb188cb9e60
Reviewed-on: https://go-review.googlesource.com/c/136655
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
Run-TryBot: Marcel van Lohuizen <mpvl@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

go.mod

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..5eb1e8b
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module golang.org/x/text
+
+require golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e

go.sum

diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..6a308d7
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e h1:FDhOuMEY4JVRztM/gsbk+IKUQ8kj74bxZrgw87eMMVc=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=