Add metadata files for either.

Bug: 155309706
Change-Id: I1ae2833aecfdc417a6634f619161bc361e86c679
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..521a159
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,49 @@
+// This file is generated by cargo2android.py --run --device --dependencies --tests.
+// Do not modify this file as changes will be overridden on upgrade.
+
+rust_defaults {
+    name: "either_defaults",
+    crate_name: "either",
+    srcs: ["src/lib.rs"],
+    test_suites: ["general-tests"],
+    auto_gen_config: true,
+    edition: "2015",
+    features: [
+        "default",
+        "use_std",
+    ],
+    rustlibs: [
+        "libserde_json",
+    ],
+}
+
+rust_test_host {
+    name: "either_host_test_src_lib",
+    defaults: ["either_defaults"],
+    test_options: {
+        unit_test: true,
+    },
+}
+
+rust_test {
+    name: "either_device_test_src_lib",
+    defaults: ["either_defaults"],
+}
+
+rust_library {
+    name: "libeither",
+    host_supported: true,
+    crate_name: "either",
+    srcs: ["src/lib.rs"],
+    edition: "2015",
+    features: [
+        "default",
+        "use_std",
+    ],
+}
+
+// dependent_library ["feature_list"]
+//   itoa-0.4.7
+//   ryu-1.0.5
+//   serde-1.0.123 "std"
+//   serde_json-1.0.64 "default,std"