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/default/Session.h b/biometrics/fingerprint/aidl/default/Session.h
index 69950fb..781e95a 100644
--- a/biometrics/fingerprint/aidl/default/Session.h
+++ b/biometrics/fingerprint/aidl/default/Session.h
@@ -43,6 +43,9 @@
 
     ndk::ScopedAStatus getAuthenticatorId(int32_t cookie) override;
 
+    ndk::ScopedAStatus invalidateAuthenticatorId(int32_t cookie,
+                                    const keymaster::HardwareAuthToken& hat) override;
+
     ndk::ScopedAStatus resetLockout(int32_t cookie,
                                     const keymaster::HardwareAuthToken& hat) override;