added postman collection and readme file

README.md

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+# Baileys API
+
+An implementation of [@adiwajshing/Baileys](https://github.com/adiwajshing/Baileys) as a simple RESTful API service with multiple device support.
+
+## Installation
+
+1. Download or clone this repo.
+2. Enter to the project directory.
+3. Execute `npm i` to install the dependencies.
+
+## Usage
+
+1. You can start the app by executing `npm run start` or `node .`.
+2. Now the endpoint should be available according to your environment variable settings. Default is at `http://localhost:8000`.
+
+## API Docs
+
+The API documentation is available online at [here](https://documenter.getpostman.com/view/18988925/UVRHiNne). You can also import the **Postman Collection File** `(postman_collection.json)` into your Postman App alternatively.
+
+The server will respond in JSON format:
+
+```javascript
+{
+    success: true|false, // bool
+    message: "", // string
+    data: {} // object
+}
+```
+
+## Notice
+
+This project is intended for learning purpose only, don't use this for spam or any activities that is prohibited by **WhatsApp**.