Update README.md

Author: gbraad

README.md

@@ -2,10 +2,18 @@ CRC Blog
 --------
 
 
-## Build
-```shell
+This is the source of the CRC blog. Content is written in markdown files and the output is generated using Hugo.
+
+
+## Usage instructions
+There are different ways to build the output on this repository.
+
+### Build using container
+The simplest way to generate the output is as follows:
+
+```bash
 $ git clone https://github.com/crc-org/blog
 $ cd blog
-$ git submodule update
+$ git submodule update --init
 $ podman run --rm -v $PWD:/workspace ghcr.io/gbraad-redhat/hugo:0.127.0 --minify
-```
+```