[docs] Added testnet content (#192)

* Added testnet content

* New section

* The asterisk thing didn't work like I imagined

* language

documentation/pages/_meta.json

@@ -3,6 +3,7 @@
     "dao": "SuiNS DAO",
     "developer": "Developer",
     "user": "User",
+    "node-operator": "Node Operator",
     "dashboard": {
         "title": "SuiNS Dashboard ↗",
         "type": "page",

documentation/pages/node-operator.mdx

@@ -0,0 +1,29 @@
+import { Callout } from 'nextra/components'
+
+# Node Operators
+
+Full nodes for the Mainnet environment process SuiNS names without additional configuration. The Mysten Labs public nodes for Testnet also resolve SuiNS names. 
+
+Mysten Labs public nodes.
+- Mainnet: https://fullnode.mainnet.sui.io:443
+- Testnet: https://fullnode.testnet.sui.io:443
+- Devnet: https://fullnode.devnet.sui.io:443
+    - SuiNS name resolution unavailable for Devnet.
+
+## Full node configuration
+
+Full node configuration is necessary for nodes to resolve SuiNS names in the Testnet environment. Devnet is not supported because of its frequent updates.
+
+<Callout type="info" emoji="ℹ️">
+Mainnet nodes resolve SuiNS names without additional configuration.
+</Callout>
+
+To configure a node for SuiNS name resolution on Testnet, add the following options to your yaml configuration file:
+
+```sh
+name-service-package-address: 0x22fa05f21b1ad71442491220bb9338f7b7095fe35000ef88d5400d28523bdd93
+name-service-registry-id: 0xb120c0d55432630fce61f7854795a3463deb6e3b443cc4ae72e1282073ff56e4
+name-service-reverse-registry-id: 0xcee9dbb070db70936c3a374439a6adb16f3ba97eac5468d2e1e6fff6ed93e465
+```
+
+For complete details on configuring a Sui Full node, see [Sui Full Node Configuration](https://docs.sui.io/guides/operator/sui-full-node) on docs.sui.io.