Upgrade go-creachadair-stringset to v0.0.11

This project was upgraded with external_updater.
Usage: tools/external_updater/updater.sh update go-creachadair-stringset
For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md

Test: TreeHugger
Change-Id: Id2b52834caa1c4f43c244a1f2b71b4e16cb9e404
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..de33292
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,8 @@
+// Needed by Go extractor.
+bootstrap_go_package {
+    name: "creachadair-stringset",
+    pkgPath: "bitbucket.org/creachadair/stringset",
+    srcs: [
+        "stringset.go",
+    ],
+}
diff --git a/METADATA b/METADATA
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index 0000000..2322b58
--- /dev/null
+++ b/METADATA
@@ -0,0 +1,23 @@
+# This project was upgraded with external_updater.
+# Usage: tools/external_updater/updater.sh update go-creachadair-stringset
+# For more info, check https://cs.android.com/android/platform/superproject/+/master:tools/external_updater/README.md
+
+name: "go-creachadair-stringset"
+description: "The stringset package implements a lightweight set-of-strings type based around Go\'s built-in map type."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://bitbucket.org/creachadair/stringset/"
+  }
+  url {
+    type: GIT
+    value: "https://bitbucket.org/creachadair/stringset/"
+  }
+  version: "v0.0.11"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2023
+    month: 3
+    day: 15
+  }
+}
diff --git a/MODULE_LICENSE_BSD b/MODULE_LICENSE_BSD
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/MODULE_LICENSE_BSD
diff --git a/NOTICE b/NOTICE
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index 0000000..7a694c9
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1 @@
+LICENSE
\ No newline at end of file