fix main declaration

readme.md

@@ -22,8 +22,11 @@ These are the primary projects used to render various types of content:
 # Update project npm config to refer to correct registry for the @doc-utils scope
 echo '@doc-utils:registry=https://gitea.jbrumond.me/api/packages/doc-utils/npm/' >> ./.npmrc
 
-# Install package
+# Install package for programatic use
 npm install --save @doc-utils/markdown2html
+
+# Install globally for CLI usage
+npm install --global @doc-utils/markdown2html
 ```