Create an AppEntitiesHeader widget

- Create a library named EntityHeaderWidgets, it can contains
  other entity header wdigets in the future.
- Create a controller of AppEntitiesHeader,
  then user can initialize its view easily.

Test: visual, robotest
Change-Id: If11b3eba75334f66b72472b2139e0e7d93984dce
Fixes: 117621156
diff --git a/packages/SettingsLib/EntityHeaderWidgets/Android.bp b/packages/SettingsLib/EntityHeaderWidgets/Android.bp
new file mode 100644
index 0000000..3ca4ecd
--- /dev/null
+++ b/packages/SettingsLib/EntityHeaderWidgets/Android.bp
@@ -0,0 +1,14 @@
+android_library {
+    name: "SettingsLibEntityHeaderWidgets",
+
+    srcs: ["src/**/*.java"],
+    resource_dirs: ["res"],
+
+    static_libs: [
+          "androidx.annotation_annotation",
+          "SettingsLibAppPreference"
+    ],
+
+    sdk_version: "system_current",
+    min_sdk_version: "21",
+}