readme: add op-signer one sentence description

ethereum-optimism · Sep 6, 2024 · c5889d1 · c5889d1
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diff --git a/README.md b/README.md
@@ -4,4 +4,5 @@ This repository is an extension of the [Optimism monorepo](https://github.com/et
 
 ## Components
 - op-conductor-mon: Monitors multiple op-conductor instances and provides a unified interface for reporting metrics.
+- op-signer: Thin gateway that supports `eth_signTransaction` RPC endpoint to sign ethereum tx payloads using private key stored in KMS
 - op-ufm: User facing monitoring creates transactions at regular intervals and observe transaction propagation across different RPC providers.