Add declare as optional

docs/quick-start/environment.mdx

@@ -53,6 +53,32 @@ yarn start
 
 Visit your app on: `http://localhost:3000`. You can interact with your smart contract using the `Debug Contracts` page. You can tweak the app config in `packages/nextjs/scaffold.config.ts`.
 
+### [OPTIONAL] Declare your smart contract:
+
+If you don't wish to deploy your contract but rather just declare for your own purpose, follow this example in `deploy.ts`:
+
+```typescript
+const declareScript = async (): Promise<void> => {
+  const response = await declareContract({
+    contract: "YourContractName",
+    options: {}, // You can add options like maxFee, nonce if needed
+  });
+};
+```
+
+After setup function at `deploy.ts` run the command :
+
+```
+yarn deploy --network {NETWORK_NAME}
+```
+
+Pay attention to the output in the terminal. The ClassHash will be displayed during the deploy contract process.
+
+```
+Declaring Contract YourContractName
+Contract Declared at 0x00...
+```
+
 **What's next**:
 
 - Edit your smart contract `YourContract.cairo` in `packages/snfoundry/contracts/src`.