Add README

README.md

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+# pnut-butter
+
+## Installation
+
+```bash
+npm install pnut-butter --save
+```
+
+## Usage
+
+Fetch the global timeline:
+
+```javascript
+const pnut = require('pnut');
+
+pnut.global().then(data => {
+  console.log(data);
+})
+```
+
+## Authentication
+
+You can set your access token like this:
+
+```javascript
+const pnut = require('pnut');
+
+pnut.token = ACCESS_TOKEN
+pnut.global().then(data => {
+  console.log(data);
+})
+```
+
+## Todo
+
+- Leave alpha status