Add getting started note

posts/Getting Started.md

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+## Getting started
+### Run on your local machine
+
+Steps to run it on your local machine:
+1. Clone this [Github repo](https://github.com/TuanManhCao/digital-garden)
+2. Install [yarn](https://classic.yarnpkg.com/lang/en/docs/install/#mac-stable) package manager 
+3. Copy all of your **markdown** file (`.md` only) and folder to `/posts/` **except** `/posts/index.md` file
+4. Go to root folder of your project, run `yarn && yarn run dev`
+5. Open this link in your browser http://localhost:3000/ 
+
+If you prefer video content have a look at my walk through video in here
+**Youtube**
+
+### Publish to the internet
+
+Setup environment (with Netlify)
+1. Create your Github account and clone [my repository](https://github.com/TuanManhCao/digital-garden)
+2. Create Netlify account and follow [this instruction](https://www.netlify.com/blog/2020/11/30/how-to-deploy-next.js-sites-to-netlify/) 
+
+
+Your normal workflow for publishing content, after initial setup is:
+1. Simply writing your content in Obisidian (or your favourite Markdown editor)
+2. Commit your changes and Push it to your Github repo