Merge pull request '[ADD] create README.md' (#1) from add_readme into master

Reviewed-on: https://git.myceliandre.fr/njeudy/hugo-from-hedgedoc/pulls/1

README.md

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+# Hugo from Hedgdoc
+
+This repository contains code to generate a Hugo website based on markedown files coming from [Hedgedoc](https://hedgedoc.org/).
+
+
+## Install
+
+### Install Hugo
+
+Follow the Hugo installation guidelines: https://gohugo.io/installation/
+
+### Install Hugo from Hedgedoc
+
+Clone the current Git repository on your computer.
+
+## Configure
+
+### Import the markdown files
+
+Markdown files must be stored in the repository `content`
+
+### Customize the theme
+
+1. Create a repo `themes`
+
+```
+mkdir themes
+```
+
+2. Import your code in the repo `themes`, for instance:
+```
+cd themes
+git clone https://github.com/matcornic/hugo-theme-learn.git
+```
+
+
+## Run your Hugo
+
+Launch the following command from your local repository:
+```
+hugo serve
+```