Add RPC documentation reference link

[ci skip]

README.md

@@ -137,6 +137,16 @@ The RPC services binds to the localhost loopback network interface, so use `rpcb
 #### Methods
 All RPC [methods](src/methods.js) are exposed on the client interface as a camelcase'd version of those available on `bitcoind`.
 
+For a more complete reference about which methods are available, check the [RPC documentation](https://bitcoin.org/en/developer-reference#remote-procedure-calls-rpcs) on the [Bitcoin Core Developer Reference website](https://bitcoin.org/en/developer-reference).
+
+##### Examples
+
+```js
+client.createRawTransaction([{ txid: '1eb590cd06127f78bf38ab4140c4cdce56ad9eb8886999eb898ddf4d3b28a91d', vout: 0 }], { 'mgnucj8nYqdrPFh2JfZSB1NmUThUGnmsqe': 0.13 });
+client.sendMany('test1', { mjSk1Ny9spzU2fouzYgLqGUD8U41iR35QN: 0.1, mgnucj8nYqdrPFh2JfZSB1NmUThUGnmsqe: 0.2 }, 6, 'Example Transaction');
+client.sendToAddress('mmXgiR6KAhZCyQ8ndr2BCfEq1wNG2UnyG6', 0.1,  'sendtoaddress example', 'Nemo From Example.com');
+```
+
 #### Batch requests
 Batched requests are support by passing an array to the `command` method with a `method` and optionally, `parameters`. The return value will be an array with all the responses.