Create a helper lib for emergency numbers.

This util class manages getting/setting default emergency numbers,
shared by settings, EmergencyInfo and other clients.

The logic is copied from Personal Safety app - http://shortn/_Z7qtV6RpJG

Bug: 172609395
Test: manual
Change-Id: I9062d84f49556d2b7e7866c43d64dac55d48f4f4
diff --git a/packages/SettingsLib/EmergencyNumber/Android.bp b/packages/SettingsLib/EmergencyNumber/Android.bp
new file mode 100644
index 0000000..3c41f78
--- /dev/null
+++ b/packages/SettingsLib/EmergencyNumber/Android.bp
@@ -0,0 +1,10 @@
+android_library {
+    name: "SettingsLibEmergencyNumber",
+
+    srcs: ["src/**/*.java"],
+    static_libs: [
+        "androidx.annotation_annotation",
+    ],
+    sdk_version: "system_current",
+    min_sdk_version: "21",
+}