Add installation guide (#36)

docs/getting-started-installation.md

@@ -0,0 +1,32 @@
+---
+id: installation
+title: Installation
+---
+
+Docusaurus was designed from the ground up to be easily installed and used to get your website up an running quickly. To install Docusaurus, follow these steps:
+
+1. Create a `website` folder in the root of your GitHub repo.
+1. `cd website`
+1. Create a `package.json` file with the following scripts that will be used when developing documentation with Docusaurus:
+
+    ```json
+    {
+      "scripts": {
+        "start": "docusaurus-start",
+        "build": "docusaurus-build",
+        "publish-gh-pages": "docusaurus-publish",
+        "examples": "docusaurus-examples"
+      }
+    }
+    ```
+1. Install Docusaurus with `yarn` or `npm`
+
+    ```
+    yarn add docusaurus -dev
+    ```
+
+    or
+
+    ```
+    npm install --save-dev docusaurus
+    ```

website/sidebars.json

@@ -1,6 +1,7 @@
 {
   "docs": {
     "Getting Started": [
+      "installation",
       "getting-started"
     ],
     "Guides": [