Add create-nightwatch docs.

guide/getting-started/onboarding-cli.md

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+## Nightwatch Onboarding CLI
+
+#### Overview
+
+This CLI tool lets you setup Nightwatch.js in your new or existing project, with all the required configs and dependencies, with just one command.
+
+#### Usage
+
+All you need to do is, run:
+
+##### NPM
+
+If you're in your existing project's root directory:
+
+<pre><code class="language-bash">npm init nightwatch</code></pre>
+
+If you want to create a new project:
+
+<pre><code class="language-bash">npm init nightwatch path/to/new/projectv</code></pre>
+
+
+##### NPX
+
+If you're in your existing project's root directory:
+
+<pre><code class="language-bash">npx create-nightwatch</code></pre>
+
+If you want to create a new project:
+
+<pre><code class="language-bash">npx create-nightwatch path/to/new/project</code></pre>
+
+and answer a few questons. We'll setup everything for you based on your preferences.
+
+
+If you'd like to skip all the questions (we'd assume best defualts for you), you can use the above commands with `--yes` or `-y` flag:
+
+##### NPM
+
+If you're in your existing project's root directory:
+
+<pre><code class="language-bash">npm init nightwatch -- --yes
+# or
+npm init nightwatch -- -y</code></pre>
+
+If you want to create a new project:
+
+<pre><code class="language-bash">npm init nightwatch path/to/new/project -- --yes
+# or
+npm init nightwatch path/to/new/project -- -y</code></pre>
+
+
+##### NPX
+
+If you're in your existing project's root directory:
+
+<pre><code class="language-bash">npx create-nightwatch --yes
+# or
+npx create-nightwatch -y</code></pre>
+
+If you want to create a new project:
+
+<pre><code class="language-bash">npx create-nightwatch path/to/new/project --yes
+# or
+npx create-nightwatch path/to/new/project -y</code></pre>