Add Polkassembly as Kusama Registrar (#5484)

docs/learn/learn-identity.md

@@ -82,7 +82,10 @@ Registrar 3: <br /> **Account**:
 
 {{ kusama: Registrar 4: <br /> **Account**: GhmpzxUyTVsFJhV7s2wNvD8v3Bgikb6WvYjj4QSuSScAUw6 <br /> **Fee**: 0.04 KSM <br /> :kusama }}
 
+{{ kusama: Registrar 5: <br /> **Account**: F1wAMxpzvjWCpsnbUMamgKfqFM7LRvNdkcQ44STkeVbemEZ <br /> **Fee**: 0 KSM <br /> :kusama }}
+
 {{ polkadot: Polkassembly (Registrar 3) provides setting on-chain ID as a service on their [website](https://polkadot.polkassembly.io/). :polkadot }}
+{{ kusama: Polkassembly (Registrar 5) provides setting on-chain ID as a service on their [website](https://kusama.polkassembly.io/). :kusama }}
 
 See [this page](./learn-guides-identity.md#registrars) to learn how to become a Registrar.