Add README.chromium file

Change-Id: I9e773d1406dce2498508373bf7f2c28e639e1813
Reviewed-on: https://skia-review.googlesource.com/c/libgifcodec/+/257377
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/README.chromium b/README.chromium
new file mode 100644
index 0000000..1ee6a0d
--- /dev/null
+++ b/README.chromium
@@ -0,0 +1,9 @@
+Name: libgif codec for Skia
+Short Name: libgifcodec
+URL: https://skia.googlesource.com/libgifcodec/
+Version: unknown
+License: MPL-1.1/GPL-2.0/LGPL-2.1 + BSD-3-Clause + BSD-2-Clause
+License File: LICENSE.md
+Security Critical: yes
+Description: See file README.md
+Local Modifications: None