chore: add examples folder and two example scripts (#18668)

add examples to web3

web3.js/examples/send_sol.js

@@ -0,0 +1,37 @@
+import * as web3 from '@solana/web3.js';
+
+(async () => {
+  // Connect to cluster
+  var connection = new web3.Connection(
+    web3.clusterApiUrl('devnet'),
+    'confirmed',
+  );
+
+  // Generate a new random public key
+  var from = web3.Keypair.generate();
+  var airdropSignature = await connection.requestAirdrop(
+    from.publicKey,
+    web3.LAMPORTS_PER_SOL,
+  );
+  await connection.confirmTransaction(airdropSignature);
+
+  // Generate a new random public key
+  var to = web3.Keypair.generate();
+
+  // Add transfer instruction to transaction
+  var transaction = new web3.Transaction().add(
+    web3.SystemProgram.transfer({
+      fromPubkey: from.publicKey,
+      toPubkey: to.publicKey,
+      lamports: web3.LAMPORTS_PER_SOL / 100,
+    }),
+  );
+
+  // Sign transaction, broadcast, and confirm
+  var signature = await web3.sendAndConfirmTransaction(
+    connection,
+    transaction,
+    [from],
+  );
+  console.log('SIGNATURE', signature);
+})();