diff --git a/doc/readme.md b/doc/readme.md
new file mode 100644
index 0000000..865832a
--- /dev/null
+++ b/doc/readme.md
@@ -0,0 +1,2 @@
+document
+
diff --git a/model/readme.md b/model/readme.md
new file mode 100644
index 0000000..20e660a
--- /dev/null
+++ b/model/readme.md
@@ -0,0 +1,2 @@
+UML model
+
diff --git a/src/readme.md b/src/readme.md
new file mode 100644
index 0000000..3642a4d
--- /dev/null
+++ b/src/readme.md
@@ -0,0 +1 @@
+srouce code