[#119] nns/docs: Integrate FrostfsID into NNS

Signed-off-by: Alexander Chuprov <a.chuprov@yadro.com>

nns/README.md

@@ -44,3 +44,32 @@ The committee makes new tokens (domains), sets, and charges a fee for issuance.
 ## Globally Unique Domain Zone
 
 For more information, see [here](../docs/globally-unique-domain-zone.md).
+
+## NNS and Frostfsid
+
+You can register a TLD domain without a committee signature using Frostfsid. To do this, create a new wallet
+```
+neo-go wallet init -w newwallet/wallet.json
+```
+
+Get wallet address:
+```
+neo-go wallet dump-keys -w newwallet/wallet.json
+[subject-address]
+[subject-key]
+```
+
+Create a subject in `FrostfsID`:
+```
+frostfs-adm morph frostfsid create-subject --subject-key="[subject-key]"
+```
+
+Grant permissions to the wallet:
+```
+frostfs-adm morph nns give-privilege --subject-address="[subject-address]"
+```
+
+Register domain:
+```
+neo-go contract invokefunction [NNS-hash] register   "subdomain.domain"  hash160:[subject-address]   "email@frostfs.info"   10000   1000   1000   1000 -- [subject-address]:Global
+```