docs(readme): tidy README.md

Author: remarkablemark

README.md

@@ -23,12 +23,16 @@ export GITHUB_TOKEN=ghp_xxx
 
 ## Install
 
+Install the package:
+
 ```sh
 npm install @remarkablemark/test
 ```
 
 ## Usage
 
+Use the package:
+
 ```js
 const { hello } = require('@remarkablemark/test');