Add METADATA / Licensing info

Change-Id: I0e41d14b7852a24ab395338d101ba6f38f880eaf
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: proc-macro-error-attr
+description: "Attribute macro for proc-macro-error crate"
+third_party {
+  url {
+    type: HOMEPAGE
+    value: "https://crates.io/crates/proc-macro-error-attr"
+  }
+  url {
+    type: GIT
+    value: "https://gitlab.com/CreepySkeleton/proc-macro-error"
+  }
+  version: "1.0.2"
+  license_type: NOTICE
+  last_upgrade_date {
+    year: 2020
+    month: 5
+    day: 6
+  }
+}
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diff --git a/MODULE_LICENSE_APACHE2 b/MODULE_LICENSE_APACHE2
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+++ b/MODULE_LICENSE_APACHE2
diff --git a/NOTICE b/NOTICE
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+LICENSE
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