Merge pull request #316 from cmagnobarbosa/add_shutdown_message

Add shutdown message to README.rst

README.rst

@@ -2,6 +2,14 @@
 Overview
 ########
 
+**WARNING: As previously announced on our communication channels, the Kytos
+project will enter the "shutdown" phase on May 31, 2021. After this date,
+only critical patches (security and core bug fixes) will be accepted, and the
+project will be in "critical-only" mode for another six months (until November
+30, 2021). For more information visit the FAQ at <https://kytos.io/faq>. We'll
+have eternal gratitude to the entire community of developers and users that made
+the project so far.**
+
 |Experimental| |Tag| |Release| |License| |Build| |Coverage| |Quality|
 
 This is a command line interface (cli) for `Kytos SDN Platform
@@ -14,7 +22,7 @@ QuickStart
 Installing
 ==========
 
-In order to use this software please install python3.6 or greater into your 
+In order to use this software please install python3.6 or greater into your
 environment beforehand.
 
 We are doing a huge effort to make Kytos and its components available on all