Add pipeline badge to README

README.md

 # Log
 
+[![pipeline status](https://git.iiens.net/brateau2015/diglog/badges/master/pipeline.svg)](https://git.iiens.net/brateau2015/diglog/commits/master)
+
 Log (diglog + analog) is a graphical environment for entering circuit schematics, and for analog 
 and digital circuit simulation. Please see [log/README](log/README) for more information.