Add METADATA / Licensing info

Change-Id: Icc17547a0292c0ed508790a2c6bc3e5814bc1594
diff --git a/METADATA b/METADATA
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--- /dev/null
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+name: structopt
+description: "Parse command line argument by defining a struct."
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/structopt"
+  }
+  url {
+    type: GIT
+    value: "https://github.com/TeXitoi/structopt"
+  }
+  version: "0.3.14"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2020
+    month: 5
+    day: 6
+  }
+}
\ No newline at end of file