Update README to provide a better explanation of setting up (#56)

* Update README to provide a better explanation of setting up

* Consolidate installation execution steps

Author: danielbachhuber

.readme-partials/DEVELOPMENT.md

@@ -1,4 +1,10 @@
 Every subfolder is a proper clone of the corresponding GitHub repository. This means that you can create new branches, make your changes, commit to the new branch and then submit as pull-request, all from within these folders.
 
-As the folders are also symlinked into the Composer `vendor` folder, you will always have the latest changes available when running WP-CLI through the `vendor/bin/wp` executable.
+Unless you have commit access to the repository, you'll need to fork the repository in order to push your feature branch. [GitHub's CLI](https://github.com/cli/cli) is pretty helpful for this:
+
+```bash
+cd core-command
+gh repo fork
+```
 
+As the folders are also symlinked into the Composer `vendor` folder, you will always have the latest changes available when running WP-CLI through the `vendor/bin/wp` executable.

.readme-partials/INSTALLATION.md

@@ -1,13 +1,18 @@
-Clone this repository onto your hard drive and then use Composer to install all dependencies:
+If you normally use WP-CLI on your web host or via Brew, you're most likely using the Phar executable (`wp-cli.phar`). This Phar executable file is the "built", singular version of WP-CLI. It is compiled from a couple dozen repositories in the WP-CLI GitHub organization.
 
-```
-git clone https://github.com/wp-cli/wp-cli-dev
-cd wp-cli-dev
-composer install
-```
-
-This will:
+In order to make code changes to WP-CLI, you'll need to set up this `wp-cli-dev` development environment on your local machine. The setup process will:
 
 1. Clone all relevant packages from the `wp-cli` GitHub organization into the `wp-cli-dev` folder, and
 2. Install all Composer dependencies for a complete `wp-cli-bundle` setup, while symlinking all of the previously cloned packages into the Composer `vendor` folder.
 3. Symlink all folder in `vendor` into corresponding `vendor` folders in each repository, thus making the centralized functionality based on Composer available in each repository subfolder.
+
+Before you can proceed further, you'll need to make sure you have [Composer](https://getcomposer.org/), PHP, and a functioning MySQL or MariaDB server on your local machine.
+
+Once the prequisites are met, clone the GitHub repository and run the installation process:
+
+```bash
+git clone https://github.com/wp-cli/wp-cli-dev wp-cli-dev
+cd wp-cli-dev
+composer install
+composer prepare-tests
+```

README.md

@@ -11,24 +11,36 @@ Quick links: [Installation](#installation) | [Development](#development) | [Usin
 
 ## Installation
 
-Clone this repository onto your hard drive and then use Composer to install all dependencies:
+If you normally use WP-CLI on your web host or via Brew, you're most likely using the Phar executable (`wp-cli.phar`). This Phar executable file is the "built", singular version of WP-CLI. It is compiled from a couple dozen repositories in the WP-CLI GitHub organization.
 
-```
-git clone https://github.com/wp-cli/wp-cli-dev
-cd wp-cli-dev
-composer install
-```
-
-This will:
+In order to make code changes to WP-CLI, you'll need to set up this `wp-cli-dev` development environment on your local machine. The setup process will:
 
 1. Clone all relevant packages from the `wp-cli` GitHub organization into the `wp-cli-dev` folder, and
 2. Install all Composer dependencies for a complete `wp-cli-bundle` setup, while symlinking all of the previously cloned packages into the Composer `vendor` folder.
 3. Symlink all folder in `vendor` into corresponding `vendor` folders in each repository, thus making the centralized functionality based on Composer available in each repository subfolder.
 
+Before you can proceed further, you'll need to make sure you have [Composer](https://getcomposer.org/), PHP, and a functioning MySQL or MariaDB server on your local machine.
+
+Once the prequisites are met, clone the GitHub repository and run the installation process:
+
+```bash
+git clone https://github.com/wp-cli/wp-cli-dev wp-cli-dev
+cd wp-cli-dev
+composer install
+composer prepare-tests
+```
+
 ## Development
 
 Every subfolder is a proper clone of the corresponding GitHub repository. This means that you can create new branches, make your changes, commit to the new branch and then submit as pull-request, all from within these folders.
 
+Unless you have commit access to the repository, you'll need to fork the repository in order to push your feature branch. [GitHub's CLI](https://github.com/cli/cli) is pretty helpful for this:
+
+```bash
+cd core-command
+gh repo fork
+```
+
 As the folders are also symlinked into the Composer `vendor` folder, you will always have the latest changes available when running WP-CLI through the `vendor/bin/wp` executable.
 
 ## Using