Re-level non-docs content to top of repo and rename content→docs

_code-samples/secure-signing/js/signPayment.js

@@ -0,0 +1,28 @@
+// Sample code demonstrating secure offline signing using xrpl.js library.
+const xrpl = require('xrpl')
+
+// Load seed value from an environment variable:
+const my_wallet = xrpl.Wallet.fromSeed(process.env['MY_SEED'])
+
+// For offline signing, you need to know your address's next Sequence number.
+// Alternatively, you could use a Ticket in place of the Sequence number.
+// This is useful when you need multiple signatures and may want to process transactions out-of-order.
+// For details, see: https://xrpl.org/tickets.html
+let my_seq = 21404872
+
+// Provide *all* required fields before signing a transaction
+const txJSON = {
+  "Account": my_wallet.address,
+  "TransactionType":"Payment",
+  "Destination":"rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn",
+  "Amount":"13000000",
+  "Flags":2147483648,
+  "LastLedgerSequence":7835923, // Optional, but recommended.
+  "Fee":"13",
+  "Sequence": my_seq
+}
+
+const signed = my_wallet.sign(txJSON)
+
+console.log("tx_blob is:", signed.tx_blob)
+console.log("tx hash is:", signed.hash)