add link to the release notes

Author: zhi-wang

README.md

@@ -8,6 +8,10 @@ Tinker9: Next Generation of Tinker with GPU Support
 Tinker9 is a complete rewrite and extension of the canonical Tinker software, currently Tinker8. Tinker9 is implemented as C++ code with OpenACC directives and CUDA kernels providing excellent performance on GPUs. At present, Tinker9 builds against the object library from Tinker8, and provides GPU versions of the Tinker ANALYZE, BAR, DYNAMIC, MINIMIZE and TESTGRAD programs. Existing Tinker file formats and force field parameter files are fully compatible with Tinker9, and nearly all Tinker8 keywords function identically in Tinker9. Over time we plan to port much or all of the remaining portions of Fortran Tinker8 to the C++ Tinker9 code base.
 
 
+## Release Notes
+[Release notes](https://github.com/TinkerTools/tinker9/discussions/197) are posted on GitHub.
+
+
 ## Docker
 Docker images are now available for [download](https://hub.docker.com/r/tinkertools/tinker9).