add readme to jimp

packages/jimp/README.md

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+<div align="center">
+  <img width="200" height="200"
+    src="https://s3.amazonaws.com/pix.iemoji.com/images/emoji/apple/ios-11/256/crayon.png">
+  <h1>Jimp</h1>
+  <p>JavaScript Image Manipulation Program</p>
+</div>
+
+The "JavaScript Image Manipulation Program" :-)
+
+An image processing library for Node written entirely in JavaScript, with zero native dependencies.
+
+The default jimp configuration.
+
+Supported types:
+
+- `@jimp/jpeg`
+- `@jimp/png`
+- `@jimp/bmp`
+- `@jimp/tiff`
+- `@jimp/gif`
+
+[Read the full docs.](http://jimp-dev.github.io/jimp/)
+
+## Installation
+
+```bash
+npm install --save jimp
+```
+
+## Usage
+
+```js
+const { Jimp } = require("jimp");
+
+// open a file called "lenna.png"
+const image = await Jimp.read("test.png");
+
+image.resize(256, 256); // resize
+
+await image.write("test-small.jpg"); // save
+```