I added two valves on supply lines to shower. When I refilled system there was no hot water to kitchen sink? What is going on?

When you worked on the supplies you disturbed some minerals built up in the pipe wall where it is now blocking the inlet port of the cartridge in your kitchen faucet. The solution would be to turn the water off to the kitchen sink, open up the valve and remove the cartridge. Check a clean the inlet ports. Before you reassemble turn the water back on for a few minutes to flush out the supply and open valve body. Reassemble and test. Good luck, Tom