Update readme

Author: hadefication

README.md

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 # Devstack
+
+## Requirements
+- PHP 8+
+- [Composer](https://getcomposer.org/)
+
+## Installation
+This assumes that PHP and Composer is already installed. To install the command do:
+- Open the terminal and run `composer global require webteractive/devstack`. This will install a CLI command `devstack`.
+- Set the configuration by running `devstack config`. This command will ask the `repository`, `branch`, and `token`.
+- Once the configuration is set, you can now initialize the EN runtimes. Just run `devstack init <runtime>`. The `<runtime>` can be `aac`, `eepower`, and `control` so to load up AllAboutCircuits runtime, all you have to do is do `devstack init aac`.
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