move templates/README to agent-runtime #3968

Job	Run time
build-and-check	2m 32s
test-integration-.agents	30s
test-integration-backend	30s
test-integration-common	32s
test-integration-cli	29s
test-backend	41s
test-integration-packages/agent-runtime	30s
test-integration-npm-app	27s
test-.agents	36s
test-integration-web	32s
test-common	38s
test-web	31s
test-npm-app	35s
test-packages/agent-runtime	40s
test-cli	36s
	10m 19s

Provide feedback