Add delegation demo

packages/cli/examples/delegate.ts

@@ -0,0 +1,38 @@
+const pen = await Secp256k1Pen.fromMnemonic("enlist hip relief stomach skate base shallow young switch frequent cry park");
+const senderAddress = pen.address("cosmos");
+
+const client = new CosmosClient("http://localhost:1317");
+
+const msg: MsgDelegate = {
+  type: "cosmos-sdk/MsgDelegate",
+  value: {
+    delegator_address: senderAddress,
+    // To get the proper validator address, start the demo chain (./scripts/wasmd/start.sh), then run:
+    //   curl http://localhost:1317/staking/validators | jq '.result[0].operator_address'
+    validator_address: "cosmosvaloper1gjvanqxc774u6ed9thj4gpn9gj5zus5u32enqn",
+    amount: coin(300000, "ustake"),
+  }
+}
+const fee = {
+  amount: coins(2000, "ucosm"),
+  gas: "120000", // 120k
+};
+const memo = "Use your power wisely";
+
+const chainId = await client.getChainId();
+console.log("Connected to chain:", chainId);
+
+const { accountNumber, sequence } = await client.getNonce(senderAddress);
+console.log("Account/sequence:", accountNumber, sequence);
+
+const signBytes = makeSignBytes([msg], fee, chainId, memo, accountNumber, sequence);
+const signature = await pen.sign(signBytes);
+const signedTx: StdTx = {
+  msg: [msg],
+  fee: fee,
+  memo: memo,
+  signatures: [signature],
+};
+
+const result = await client.postTx(signedTx);
+console.log("Post result:", result);