docs(readme): Add readme file

Author: goncaloneves

README.md

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+Serverless Optimizer Plugin
+=============================
+[![serverless](http://public.serverless.com/badges/v3.svg)](http://www.serverless.com)
+
+Bundle with Browserify, transpile with Babel to ES5 and minify with Uglify your Serverless functions.
+
+This plugin is a child of the great [serverless-optimizer-plugin](https://github.com/serverless/serverless-optimizer-plugin). Kudos!
+
+**Note:** Requires Serverless *v1.0.0* or higher.
+
+## Setup
+
+ Install via npm in the root of your Serverless service:
+```
+npm install serverless-plugin-optimize babel-preset-es2015 --save-dev
+```
+
+* Add the plugin to the `plugins` array in your Serverless `serverless.yml`, like this:
+
+```yml
+plugins:
+  - serverless-plugin-optimize
+```
+
+* All done!
+
+## Options
+
+Configuration options can be set globally in `custom` property and inside function in `optimize` property.
+
+#### Global
+
+* **debug** (default `false`) - When debug is set to `true` it won't remove `prefix` folder and will generate debug output at the end of package creation.
+
+```yml
+custom:
+  optimize:
+    debug: true
+```
+
+* **exclude** (default `aws-sdk`) - Array of modules that will be globally excluded from all the bundles.
+
+```yml
+custom:
+  optimize:
+  	exclude: ['ajv']
+```
+
+* **minify** (default `true`) - When mininify is set to `false` your functions won't be minified.
+
+```yml
+custom:
+  optimize:
+  	minify: false
+```
+
+* **presets** (default `es2015`) - Array of Babel presets.
+
+```yml
+custom:
+  optimize:
+  	presets: ['es2016']
+```
+
+#### Function
+
+* **optimize** (default `true`) - When optimize is set to `false` the specific function won't be optimized.
+
+```yml
+functions:
+  hello:
+    optimize: false
+```
+
+* **exclude** - Array of modules that will be excluded from the specific function.
+
+```yml
+functions:
+  hello:
+    optimize:
+      exclude: ['ajv']
+```
+
+## Contribute
+
+Help us making this plugin better and future proof.
+
+   * Clone the code
+   * Install the dependencies with `npm install`
+   * Create a feature branch `git checkout -b new_feature`
+   * Lint with standard `npm run lint`
+
+## License
+
+This software is released under the MIT license. See [the license file](LICENSE) for more details.