Add NetworkStack app

The app is not started yet, and does not contain any service for now.

Test: built, booted
Bug: b/112869080
Change-Id: Id5a0fd02c891100e85d86b1040e53beec3581950
diff --git a/Android.bp b/Android.bp
new file mode 100644
index 0000000..55bb517
--- /dev/null
+++ b/Android.bp
@@ -0,0 +1,37 @@
+//
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// Library including the network stack, used to compile the network stack app, or linked into the
+// system server on devices that run the stack there
+java_library {
+    name: "NetworkStackLib",
+    installable: true,
+    srcs: [
+        "src/**/*.java",
+    ],
+}
+
+// Updatable network stack packaged as an application
+android_app {
+    name: "NetworkStack",
+    platform_apis: true,
+    certificate: "platform",
+    privileged: true,
+    static_libs: [
+        "NetworkStackLib"
+    ],
+    manifest: "AndroidManifest.xml",
+}
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