Add metadata files

Change-Id: I987cdcc614cf0047ae0a70b8c148e608c34068f7
diff --git a/LICENSE b/LICENSE
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+LICENSE-APACHE
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diff --git a/METADATA b/METADATA
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+name: "rand_chacha"
+description:
+    "ChaCha random number generator"
+
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/rand_chacha"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/rust-random/rand"
+  }
+  version: "0.2.2"
+  last_upgrade_date { year: 2020 month: 6 day: 18 }
+  # Dual-licensed, using the least restrictive per go/thirdpartylicenses#same.
+  license_type: NOTICE
+}
diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
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+++ b/MODULE_LICENSE_APACHE2