Update README.md

Signed-off-by: Radoslav Dimitrov <[email protected]>

Author: rdimitrov

README.md

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+----------------------------
+## Deprecation notice:
+
+The code base of this project got donated to https://github.com/theupdateframework/go-tuf where it replaced the existing implementation and is now being distributed under the v2 version. 
+
+That said take into account that I'll be archiving this repository in a few weeks so feel free to switch to https://github.com/theupdateframework/go-tuf/v2
+
+I'm happy to see how something that started as a PoC while being sick with COVID progressed to replacing the existing go-tuf code a year later. 
+
+Thanks to everyone that helped.
+
+----------------------------
+
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