feat: add readme

README.md

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+[![status-badge](https://ci.batsense.net/api/badges/108/status.svg)](https://ci.batsense.net/repos/108)
+
+---
+
+# mcaptcha-api-js: Library to interact with with mCaptcha API
+
+This library provides a convenient interface to validate [mCaptcha authorization
+tokens](https://mcaptcha.org/docs/webmasters/terminology#authorization-token) presented by
+Visitors against your mCaptcha instance.
+
+## Install
+
+```bash
+npm i @mcaptcha/mcaptcha-api-js
+```
+
+## Example
+
+```javascript
+let mcaptcha = new MCaptcha(
+	"sitekeyfromdashboard",
+	"settingsfromdashboardsettingspage",
+	"https://mcaptcha.example.org"
+);
+let res = await mcaptcha.verify("token");
+console.log(`verification status: ${res}`);
+```