Add README file

First version includes documentation for getting started and a basic
explanation of the theme's organization.

README.md

@@ -12,7 +12,7 @@ Follow the [Hugo Quickstart](https://gohugo.io/getting-started/quick-start/)
 instructions on how to install Hugo, create a site, and install a theme.
 Installing the theme as a git submodule is the preferred way.
 
-```
+```sh
 git add submodule https://git.thecorams.net/kevin/basic-theme.git themes/basic-theme
 ```
 
@@ -21,7 +21,7 @@ git add submodule https://git.thecorams.net/kevin/basic-theme.git themes/basic-t
 The theme includes an example site to give a quick way to see how the theme
 looks and behaves.
 
-```
+```sh
 cd exampleSite
 hugo serve [ -D ] --themesDir ../..
 ```