Separate YogaLayout library from sample app

Summary: The sample app has library-like elements (i.e. the `YogaLayout` and associated files).  This separates them out into a separate tree.

Reviewed By: emilsjolander

Differential Revision: D4558263

fbshipit-source-id: 33f8cec99661ef20e0e882663b554c12ae33c12f

android/BUCK

@@ -0,0 +1,36 @@
+# Copyright (c) 2014-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under the BSD-style license found in the
+# LICENSE file in the root directory of this source tree. An additional grant
+# of patent rights can be found in the PATENTS file in the same directory.
+
+include_defs('//YOGA_DEFS')
+
+android_aar(
+  name = 'android',
+  manifest_skeleton = 'AndroidManifest.xml',
+  deps = [
+    ANDROID_JAVA_TARGET,
+    ANDROID_RES_TARGET,
+    INFER_ANNOTATIONS_TARGET,
+    JAVA_TARGET,
+    PROGRUARD_ANNOTATIONS_TARGET,
+  ],
+  visibility = [
+    'PUBLIC',
+  ],
+)
+
+android_resource(
+  name = 'res',
+  res = 'src/main/res',
+  package = 'com.facebook.yoga.android',
+  visibility = [
+    'PUBLIC',
+  ],
+)
+
+project_config(
+  src_target = ':android',
+)