Add metadata files

Change-Id: I86f57bcce4b1451af35ee4ab3dac117bfb63d176
diff --git a/METADATA b/METADATA
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+name: "rand"
+description:
+    "Random number generators and other randomness functionality."
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/rand"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/rust-random/rand"
+  }
+  version: "0.7.3"
+  last_upgrade_date { year: 2020 month: 6 day: 18 }
+  license_type: NOTICE
+}