Add Permission Delegation sample code

_code-samples/delegate-permissions/js/README.md

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+# Delegate Permissions (JavaScript) Sample Code
+
+These code samples demonstrate how to delegate permissions to another account and how to send an a transaction as a delegate, using xrpl.js 4.3 in Node.js.
+
+## Usage
+
+1. First, install dependencies.
+
+    ```sh
+    npm i
+    ```
+
+2. Go to the [XRP Faucet](https://xrpl.org/resources/dev-tools/xrp-faucets) and generate a **Devnet** account to be your delegate account.
+
+3. Edit `delegate-permisions.js` and change the following line to use the address you got from the faucet:
+
+    ```js
+        const delegate_address = "r9GAKojMTyexqvy8DXFWYq63Mod5k5wnkT"
+    ```
+
+4. Run `delegate-permissions.js`.
+
+    ```sh
+    node delegate-permissions.js
+    ```
+
+    If it runs successfully, it should output several things including "Delegate successfully set." followed by an [account_objects API method](https://xrpl.org/docs/references/http-websocket-apis/public-api-methods/account-methods/account_objects) response showing the delegate permissions.
+
+    Take note of the `account` address in this output. That's the address of the delegating account.
+
+5. Run `use-delegate-permissions.js` and provide both the delegating account's address (from the previous step's output) and the delegate's secret key (from the devnet faucet earlier).
+
+    If it runs successfully, it should output various things ending in the following:
+    
+    ```text
+    Transaction successful.
+    Domain is example.com
+    ```