add deprecation info to readme

Signed-off-by: Qinghao Shi <[email protected]>

README.rst

@@ -3,5 +3,9 @@
 #################################################
 
 
-Latest documentation of riscv_ctg : `click here <https://riscv-ctg.readthedocs.io/en/latest>`_
+This repository now deprecated, the code already merged into `riscv-arch-test <https://github.com/riscv-non-isa/riscv-arch-test/tree/dev/riscv-ctg>`_
+#################################################
+
 
+If make changes are required, please raise pull request against `riscv-arch-test <https://github.com/riscv-non-isa/riscv-arch-test/tree/dev/riscv-ctg>`_
+#################################################