Add METADATA file

This sets component 1478276 (Fuchsia > Toolchain > Go) as the place to
create new bugs. Without it, flake fetcher will file bugs in the default
component and assign to a random member of the OWNERS file.

Change-Id: I97485e28c23b8beba2f162b286133a2800dafd78
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/go/+/1024832
Reviewed-by: Bruno Dal Bo <brunodalbo@google.com>
Commit-Queue: Peter DeLong <pdelong@google.com>

METADATA.textproto

diff --git a/METADATA.textproto b/METADATA.textproto
new file mode 100644
index 0000000..bc95ba1
--- /dev/null
+++ b/METADATA.textproto
@@ -0,0 +1,16 @@
+# proto-file: tools/metadata/proto/metadata.proto
+# proto-message: Metadata
+# https://fuchsia.dev/fuchsia-src/development/source_code/metadata
+
+last_reviewed_date: {
+  year: 2024
+  month: 4
+  day: 10
+}
+
+trackers: {
+  issue_tracker: {
+    # Fuchsia > Toolchain > Go
+    component_id: 1478276
+  }
+}