Update README.md

Author: hello-smile6

README.md

@@ -1,2 +1,11 @@
 # nodejs-client
 The NodeJS client for SpellCheckJS
+## Installation
+```
+npm i --save https://api.github.com/repos/SpellCheckJS/nodejs-client/tarball
+```
+## Usage
+```javascript
+const spellcheck=require("SpellCheckJS");
+console.log(spellcheck.applyCorrections("the witdh of malpe leaves is hard to guess"));
+```