feat: add tutorial (#1381)

* feat: add tutorial

* feat: complete tutorial

* Fix link

docs/tutorial-setup.md

@@ -0,0 +1,74 @@
+---
+id: tutorial-setup
+title: Setting Up
+---
+
+This tutorial is geared at first-time users who want detailed instructions on how to go from zero to a Docusaurus that is versioned. Let's start!
+
+<img alt="Docusaurus campfire" src="/img/undraw_docusaurus_mountain.svg" style="max-width: 600px; margin: 3rem auto"/>
+
+## Install Node.js
+
+Node.js is an environment that can run JavaScript code outside of a web browser and is used to write and run server-side JavaScript apps.
+
+> Docusaurus' minimum supported Node.js version is Node 8, but more recent versions will work as well.
+
+1. Open your Terminal.
+1. Run the following command to install Node and `npm` the package manager that allows you to install npm modules from your terminal.
+
+```sh
+brew install node
+```
+
+Alternatively, you can download an installer from the [Node.js homepage][https://nodejs.org/en/].
+
+## Check your Node.js installation
+
+Check that you have the minimum required version installed by running the following command:
+
+```sh
+node -v
+```
+
+You should see a version larger than Node 8.
+
+```sh
+node -v
+v8.15.1
+```
+
+## Install Yarn (Optional)
+
+We highly recommend you to install Yarn, an alternative package manager that has superb performance for managing your NPM dependencies. Check it out [here](https://yarnpkg.com/en/docs/install).
+
+> You can still proceed with the tutorial without Yarn.
+
+## Create a GitHub Repository
+
+1. Go to https://github.com/ and sign up for an account if you don't already have one.
+1. Click on **"New Repository"** or go to https://github.com/new.
+1. Name your repository without spaces. For e.g. `docusaurus-tutorial`.
+1. Proceed to create the repository without adding `.gitignore` or a license.
+1. Clone your repository to your local machine:
+
+```sh
+git clone git@github.com:USERNAME/docusaurus-tutorial.git
+```
+
+6. `cd` into the repository which you just created.
+
+## Install the Docusaurus init command
+
+Docusaurus comes with a command line tool to help you scaffold a Docusaurus site with some example templates. Let's install the installer!
+
+1. Run the following command:
+
+```sh
+npm install --global docusaurus-init
+```
+
+or if you have Yarn:
+
+```sh
+yarn global add docusaurus-init
+```