Add build status badge

README.md

-# Resume [![resume](https://img.shields.io/badge/example-pdf-green.svg)](https://sadmansk.com/resume.pdf)
+# Resume [![resume](https://img.shields.io/badge/example-pdf-green.svg)](https://sadmansk.com/resume.pdf) [![build status](https://git.sadmansk.com/sadmansk/resume/badges/master/build.svg)](https://git.sadmansk.com/sadmansk/resume/commits/master)
 
 ## Setup
 
@@ -9,4 +9,7 @@ $ xelatex resume-cv.tex
 ```
 And the pdf will be save as `resume.pdf`.
 
+> Note: If the build is running, the image below and the pdf link above will be 
+broken. So please recheck after 15 minutes.
+
 ![Resume Image](https://sadmansk.com/resume.png)