docs: add Coconut Battery recommendation

README.md

@@ -126,6 +126,7 @@ This repo is inspired by the [@jbrandchaud/til](https://github.com/jbranchaud/ti
 
 ### MacOS
 
+- [App recommendation: Coconut Battery](macos/app-recommendation-coconut-battery.md)
 - [Show hidden files in Finder](macos/show-hidden-files-in-finder.md)
 
 ### Markdown

macos/app-recommendation-coconut-battery.md

@@ -0,0 +1,18 @@
+# App recommendation: Coconut Battery
+
+Coconut Battery is a free app that shows you the current battery health of your MacBook. It shows:
+
+- the current battery capacity,
+- the original battery capacity,
+- the current charge,
+- the battery cycles,
+- battery temperature,
+- battery power usage,
+- power adapter info,
+- and more.
+
+It's a great way to keep track of your battery health and to see if you need to replace your battery. It's a must-have app for any MacBook user.
+
+![image](https://gist.github.com/assets/24983797/23f106cf-b22c-4169-8bc8-148641dfed3e)
+
+You can download it from [coconut-flavour.com](https://coconut-flavour.com/coconutbattery/).