Add Fossa badge

README.rst

@@ -20,6 +20,9 @@ Glances - An eye on your system
 .. image:: https://img.shields.io/scrutinizer/g/nicolargo/glances.svg
     :target: https://scrutinizer-ci.com/g/nicolargo/glances/
 
+.. image:: https://app.fossa.io/api/projects/git%2Bgithub.com%2Fnicolargo%2Fglances.svg?type=shield
+    :target: https://app.fossa.io/projects/git%2Bgithub.com%2Fnicolargo%2Fglances?ref=badge_shield
+
 .. image:: https://img.shields.io/badge/Donate-PayPal-green.svg
     :target: https://www.paypal.me/nicolargo