diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..b672fde
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+obj
diff --git a/img/diagram.png b/img/diagram.png
new file mode 100644
index 0000000..2e8640c
Binary files /dev/null and b/img/diagram.png differ