Update readme to reflect on how badly tested this is

README.md

 npm i xrpio
 ```
 
+# Caution
+This library is in an early stage of development and **breaking changes may occur spontaneously and without regard of semantic versioning until the v1.0.0 release**.
+
+## <span style="color:red"> Operation on the main-net is untested and should not be used in production! </span>
+<br />
+
 # Quickstart
 ```typescript
 import {RippleAPI} from 'ripple-lib'
 console.log(data) //"Arbitrary string data 123"
 ```
 
-# A simple run-ready example for the testnet
+# A simple ready-to-run example for the testnet
 ```typescript
 import { treeRead, treeWrite, Wallet } from 'xrpio'
 import { RippleAPI } from 'ripple-lib'