Add Comment to readme.md

README.md

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 # boa-sdk-ts
 SDK to interface with the BOSAGORA blockchain
+boa-sdk-ts is a TypeScript/JavaScript library for communicating with the Stoa API server.
+It also has utility functions such as hashing and pre-image validation.
+
+## Install
+```bash
+$ npm install --save boa-sdk-ts
+```
+
+## Import the your library
+```import * as BoaSdk from "boa-sdk-ts";```
+
+## Usage
+```TypeScript
+// Create BOA Client
+let boa_client = new BoaSdk.BOAClient("http://localhost:3836");
+
+// Query
+boa_client.getValidator("GA3DMXTREDC4AIUTHRFIXCKWKF7BDIXRWM2KLV74OPK2OKDM2VJ235GN", 10)
+.then((validators: Array<BoaSdk.Validator>) =>
+{
+    // On Success
+})
+.catch(err =>
+{
+    // On Error
+});
+```
+
+## Testing
+```bash
+$ git clone https://github.com/bpfkorea/boa-sdk-ts.git
+$ npm install
+$ npm run build
+$ npm test
+```