diff --git a/.gitignore b/.gitignore
index 23ba50b..d8fd688 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,4 @@
 .vagrant
 .*.sw[op]
+*.bak
+.DS_Store
diff --git a/Karto/README.md b/Karto/README.md
new file mode 100644
index 0000000..0122bfd
--- /dev/null
+++ b/Karto/README.md
@@ -0,0 +1,11 @@
+useful commands:
+- zoom ext
+- line
+- trim / extend
+- offset
+- "signature": sketch
+- donut
+- xline: for coordinate axis (infinite lines)
+
+- f8: perpendicular
+- f2: console
diff --git a/Karto/lesson2.dwg b/Karto/lesson2.dwg
new file mode 100644
index 0000000..7ac591f
Binary files /dev/null and b/Karto/lesson2.dwg differ