README update - sls plugin install

README.md

@@ -6,10 +6,15 @@
 [![npm](https://img.shields.io/npm/v/serverless-cloudside-plugin.svg)](https://www.npmjs.com/package/serverless-cloudside-plugin)
 [![npm](https://img.shields.io/npm/l/serverless-cloudside-plugin.svg)](https://www.npmjs.com/package/serverless-cloudside-plugin)
 
-This plugin allows you to use AWS CloudFormation intrinsic functions (such as `!Ref` and `!GetAt`) to reference cloud resources during local development. When added to your `environment` variables, these values are replaced with the same identifiers used when deployed to the cloud. You can invoke your functions locally, use the `serverless-offline` plugin, or use a compatible test runner that uses the `serverless invoke test` command. You can now keep your `serverless.yml` files free from pseudo variables and other concatenated strings and simply use the the built-in CloudFormation features.
+This plugin allows you to use AWS CloudFormation intrinsic functions (such as `!Ref` and `!GetAt`) to reference cloud resources during local development. When added to your `environment` variables, these values are replaced with the same identifiers used when deployed to the cloud. You can invoke your functions locally, use the `serverless-offline` plugin, or use a compatible test runner that uses the `serverless invoke test` command. You can now keep your `serverless.yml` files free from pseudo variables and other concatenated strings and simply use the built-in CloudFormation features.
 
 ## Installation
 
+#### Install using Serverless plugin manager
+```bash
+serverless plugin install --name serverless-cloudside-plugin
+```
+
 #### Install using npm
 
 Install the module using npm: