Add OSSFuzz badge to TensorFlow.

Now that TF <-> OSSFuzz works again, add badge to show that we are fuzzing the code.

PiperOrigin-RevId: 317140301
Change-Id: I401c1ffd3da37f44910fde3ba60fb2b5c925dfcc

README.md

@@ -95,6 +95,7 @@ for general questions and discussion, and please direct specific questions to
 The TensorFlow project strives to abide by generally accepted best practices in
 open-source software development:
 
+[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/tensorflow.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:tensorflow)
 [![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/1486/badge)](https://bestpractices.coreinfrastructure.org/projects/1486)
 [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-v1.4%20adopted-ff69b4.svg)](CODE_OF_CONDUCT.md)
 

tensorflow/security/README.md

 # TensorFlow Security Advisories
 
+[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/tensorflow.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:tensorflow)
+
 We regularly publish security advisories about using TensorFlow.
 
 *Note*: In conjunction with these security advisories, we strongly encourage