Add authenticatorId changes to Fingerprint aidl

Also adds a top-level README for the biometric package

Bug: 159667191
Bug: 168541000

Test: make -j56 android.hardware.biometrics.fingerprint-update-api
Test: make -j56 VtsHalBiometricsFingerprintTargetTest

Change-Id: I3dba8e7ee16700865662c1a00b75576d2513f930
diff --git a/biometrics/fingerprint/aidl/vts/VtsHalBiometricsFingerprintTargetTest.cpp b/biometrics/fingerprint/aidl/vts/VtsHalBiometricsFingerprintTargetTest.cpp
index 88980bf..1a39ad4 100644
--- a/biometrics/fingerprint/aidl/vts/VtsHalBiometricsFingerprintTargetTest.cpp
+++ b/biometrics/fingerprint/aidl/vts/VtsHalBiometricsFingerprintTargetTest.cpp
@@ -82,6 +82,14 @@
         return ndk::ScopedAStatus::ok();
     }
 
+    ndk::ScopedAStatus onAuthenticatorIdRetrieved(int64_t /*authenticatorId*/) override {
+        return ndk::ScopedAStatus::ok();
+    }
+
+    ndk::ScopedAStatus onAuthenticatorIdInvalidated() override {
+        return ndk::ScopedAStatus::ok();
+    }
+
   private:
     std::promise<SessionCallbackInvocation> invocation_promise_;
 };