Add Nado documentation and examples, including new API endpoints, FAQs, and guides for using the TypeScript SDK. Update .env.example with additional configuration options.

docs/nado/developer-resources/api/archive-indexer/linked-signer-rate-limit.md

@@ -0,0 +1,52 @@
+# Linked Signer Rate Limit
+
+A subaccount can perform a max of 50 [LinkSigner](https://docs.nado.xyz/developer-resources/api/gateway/executes/link-signer) requests in 7 days. Use this query to check current usage and wait time.
+
+## Rate limits
+
+* 1200 requests/min or 200 requests/10secs per IP address. (**weight = 2**)
+
+{% hint style="info" %}
+See more details in [API Rate limits](https://docs.nado.xyz/developer-resources/api/rate-limits)
+{% endhint %}
+
+## Request
+
+{% tabs %}
+{% tab title="Link Signer Rate Limit" %}
+Queries a subaccount's linked signer rate limits.
+
+<mark style="color:orange;">`POST [ARCHIVE_ENDPOINT]`</mark>
+
+**Body**
+
+```json
+{
+  "linked_signer_rate_limit": {
+    "subaccount": "0x9b9989a4E0b260B84a5f367d636298a8bfFb7a9b42544353504f540000000000"
+  }
+}
+```
+
+{% endtab %}
+{% endtabs %}
+
+## Response
+
+```json
+{
+  "remaining_tx": "50",
+  "wait_time": 0,
+  "signer": "0x0000000000000000000000000000000000000000",
+  "total_tx_limit": "50"
+}
+```
+
+{% hint style="info" %}
+**Notes**:
+
+* <mark style="color:red;">`remaining_tx`</mark>: keeps track of the remaining <mark style="color:red;">`LinkSigner`</mark> executes that can be performed.
+* <mark style="color:red;">`total_tx_limit`</mark>: that max weekly tx limit.
+* <mark style="color:red;">`wait_time`</mark>: the total seconds you need to wait before performing another <mark style="color:red;">`LinkSigner`</mark> execute. Can only perform another request when <mark style="color:red;">`wait_time`</mark> is `0`.
+* <mark style="color:red;">`signer`</mark>: the current linked signer address (20 bytes) associated to the provided `subaccount`. It returns the zero address when no signer is linked.
+  {% endhint %}