Add README.md and include Vela

Change-Id: Ic7ab88f43758dda4009df1840261c7f62a7b48bc
diff --git a/.gitignore b/.gitignore
index 280e625..a2a4412 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 /core_software
+/vela