Create TEST_MAPPING file

Test: atest --test-mapping
Bug: 277819423
Change-Id: I8a8e50fdab1ab13f6597d8966cbcb36409c9c0db
diff --git a/libraries/flag-helpers/TEST_MAPPING b/libraries/flag-helpers/TEST_MAPPING
new file mode 100644
index 0000000..f8b3f85
--- /dev/null
+++ b/libraries/flag-helpers/TEST_MAPPING
@@ -0,0 +1,12 @@
+{
+  "presubmit": [
+    {
+      "name": "FlagAnnotationTests",
+      "options": [
+        {
+          "include-filter": "android.cts.flags.tests.FlagAnnotationTest"
+        }
+      ]
+    }
+  ]
+}