Add code samples for markers and pagination.

content/_code-samples/markers-and-pagination/README.md

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+# Markers and Pagination
+
+Iterate over a `ledger_data` method request that requires multiple calls.
+
+Examples from the [Markers and Pagination page](https://xrpl.org/markers-and-pagination.html#markers-and-pagination).

content/_code-samples/markers-and-pagination/js/pagination-with-markers.js

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+const xrpl = require("xrpl")
+
+async function main() {
+
+  // Create client and connect to network.
+  const client = new xrpl.Client("wss://xrplcluster.com/")
+  await client.connect()
+
+  // Query ledger data.
+  let ledger = await client.request({
+    "command": "ledger_data",
+    "ledger_index": 500000,
+  })
+
+  // Create function to loop through API calls.
+  function code(){
+    console.log(ledger["result"])
+  }
+ 
+  // Run code at least once before checking for markers.
+  do {
+    code()
+    
+    if (ledger["result"]["marker"] == null) {
+        break
+    }
+
+    const ledger_marker = await client.request({
+        "command": "ledger_data",
+        "ledger_index": 500000,
+        "marker": ledger["result"]["marker"]
+    })
+    ledger = ledger_marker
+
+  } while (true)
+
+  client.disconnect()
+}
+
+main()

content/_code-samples/markers-and-pagination/py/pagination-with-markers.py

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+from xrpl.clients import JsonRpcClient
+from xrpl.models.requests import LedgerData
+
+# Create a client to connect to the main network.
+client = JsonRpcClient("https://xrplcluster.com/")
+
+# Specify ledger to query and request data.
+ledger = LedgerData(ledger_index=500000)
+ledger_data = client.request(ledger).result
+
+# Code to run on each call.
+def code():
+    print(ledger_data)
+
+#Execute code at least once before checking for markers.
+while True:
+    code()
+    if "marker" not in ledger_data:
+        break
+    
+    # Specify ledger and marker to continue querying.
+    ledger_marker = LedgerData(ledger_index=500000, marker=ledger_data["marker"])
+    ledger_data = client.request(ledger_marker).result