Create master.tryserver.libyuv bucket

Also README.md, OWNERS and other std files

R=kjellander@chromium.org
BUG=551062

Review URL: https://codereview.chromium.org/1576093005 .

OWNERS

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+fbarchard@chromium.org
+kjellander@chromium.org
+nodir@chromium.org

README.md

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+This branch contains libyuv project-wide configurations
+for chrome-infra services.

codereview.settings

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+# This file is used by gcl and git-cl to get repository specific information.
+CODE_REVIEW_SERVER: codereview.chromium.org
+PROJECT: libyuv

cr-buildbucket.cfg

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+# Defines buckets on cr-buildbucket.appspot.com, used by to schedule builds
+# on buildbot. In particular, CQ uses some of these buckets to schedule tryjobs.
+#
+# See http://luci-config.appspot.com/schemas/projects:buildbucket.cfg for
+# schema of this file and documentation.
+#
+# Please keep this list sorted by bucket name.
+
+buckets {
+  name: "master.tryserver.libyuv"
+  acls {
+    role: READER
+    group: "all"
+  }
+  acls {
+    role: SCHEDULER
+    group: "project-libyuv-tryjob-access"
+  }
+  acls {
+    role: WRITER
+    identity: "libyuv@chrome-infra-auth.iam.gserviceaccount.com"
+  }
+}

project.cfg

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+# For the schema of this file and documentation, see ProjectCfg message in
+# https://luci-config.appspot.com/schemas/projects:project.cfg
+
+name: "libyuv"
+access: "group:all" # public