add some contents

docs/website/pages/learn/miscellaneous/portal-features/liquidity.en-US.mdx

@@ -30,3 +30,15 @@ You can see the LP situation of the group just now:
 Click the `Remove` button on the right to unstaking:
 
 ![](/docs/portal/liquidity/liquidity-remove.png)
+
+## Earn token pairs
+
+After forming an LP, you can stake the LP to Farm to obtain the income of the token pair. If you simply form a token pair, there will be no income.
+
+![](/docs/portal/liquidity/liquidity-farm.png)
+
+Click the `Stake LP` button to stake token pairs:
+
+![](/docs/portal/liquidity/liquidity-stake-lp.png)
+
+After staking an LP, you can obtain `$LPXP` income.

docs/website/pages/learn/miscellaneous/portal-features/liquidity.zh-CN.mdx

@@ -30,3 +30,15 @@ Rooch 现在推出 `RGas` 和 `GROW` 代币对质押，接下来通过一个简
 点击右侧 `Remove` 按钮，可以解质押：
 
 ![](/docs/portal/liquidity/liquidity-remove.png)
+
+## 赚取代币对收益
+
+当组好 LP 后，可以将 LP 质押到 Farm 获取代币对的收益，如果单纯组代币对是没有收益的。
+
+![](/docs/portal/liquidity/liquidity-farm.png)
+
+点击 `Stake LP` 按钮进行代币对质押：
+
+![](/docs/portal/liquidity/liquidity-stake-lp.png)
+
+质押 LP 后，可以获取 `$LPXP` 收益。