Fix Makefile and add Readme.md

Change-Id: Id5209a575912d3217beb03828394af4bf4d71f47
diff --git a/.gitignore b/.gitignore
index 8aa2331..bd41ace 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,6 +7,7 @@
 
 # Downloaded binaries
 bin/
+lib/
 
 # Source data directories
 I5/