feat: Set balance (#160)

pages/docs/configuration/dotenv.mdx

@@ -696,7 +696,8 @@ see: **[Token Usage](/docs/configuration/token_usage)**
 #### Managing Balances
 
 - Run `npm run add-balance` to manually add balances.
-- You can also specify the email and token credit amount to add, e.g.: `npm run add-balance [email protected] 1000`
+    - You can also specify the email and token credit amount to add, e.g.: `npm run add-balance [email protected] 1000`
+- Run `npm run set-balance` to manually set balances, similar to `add-balance`.
 - Run `npm run list-balances` to list the balance of every user.
 
 > **Note:** 1000 credits = $0.001 (1 mill USD)

pages/docs/configuration/token_usage.mdx

@@ -35,6 +35,16 @@ npm run add-balance
 npm run add-balance [email protected] 1000
 ```
 
+Additionally, you can set a balance for a user. An existing balance will be overwritten by the new balance.
+
+```bash filename="To manually set balances, run the following command (npm required):"
+npm run set-balance
+```
+
+```bash filename="You can also specify the email and token credit amount to set, e.g.:"
+npm run set-balance [email protected] 1000
+```
+
 This works well to track your own usage for personal use; 1000 credits = $0.001 (1 mill USD)
 
 ## Listing of balances