doc: added CI badge

Author: egbakou

README.md

@@ -1,5 +1,5 @@
 
-
+[![CI](https://github.com/lioncoding-oss/FileSizeFromBase64.NET/actions/workflows/ci.yml/badge.svg)](https://github.com/lioncoding-oss/FileSizeFromBase64.NET/actions/workflows/ci.yml)
 <div style="text-align:center"><img src="art/logo.png" width=140 /></div>
 
 # FileSizeFromBase64.NET
@@ -65,4 +65,4 @@ The MIT License (MIT) see [License file](https://github.com/lioncoding-oss/FileS
 
 ## Contribution
 
-Feel free to create issues and PRs 😃
+Feel free to create issues and PRs 😃