diff --git a/README.md b/README.md
index 8968f34..c1f1c4a 100644
--- a/README.md
+++ b/README.md
@@ -1,10 +1,20 @@
 # MIDI BOARD TWO
 
 ## Second MIDI-Board-Project with SD-Card-Reader and LCD-Display!
- 
-### Testing Tool
 
-This tool is only a testing tool. If you upload it to your Arduino Device, all LEDs will be switched on. After it, you can
-switch out all the LEDs if you press all your Buttons.
+### Directory Structure
 
-Only for testing your circuit.
+There are some differnent directories in the repository.
+
+
+* doc
+
+Here you can find some documentary about the project.
+
+* tools
+
+There are some testing-tools for testing the functionality of your board.
+
+* main
+
+In this folder you can find the main program - the firmware - for your MIDI-Board.
diff --git a/doc/midi_board_two.skp b/doc/midi_board_two.skp
new file mode 100644
index 0000000..b00850f
Binary files /dev/null and b/doc/midi_board_two.skp differ
diff --git a/doc/parts.ods b/doc/parts.ods
new file mode 100644
index 0000000..2e10be5
Binary files /dev/null and b/doc/parts.ods differ
diff --git a/main/main/main.ino b/main/main/main.ino
new file mode 100644
index 0000000..95c2b6e
--- /dev/null
+++ b/main/main/main.ino
@@ -0,0 +1,9 @@
+void setup() {
+  // put your setup code here, to run once:
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+}
diff --git a/tools/testing/README.md b/tools/testing/README.md
index 8968f34..6f1814a 100644
--- a/tools/testing/README.md
+++ b/tools/testing/README.md
@@ -4,7 +4,7 @@
  
 ### Testing Tool
 
-This tool is only a testing tool. If you upload it to your Arduino Device, all LEDs will be switched on. After it, you can
+This tool is a simple testing tool. If you upload it to your Arduino Device, all LEDs will be switched on. After it, you can
 switch out all the LEDs if you press all your Buttons.
 
 Only for testing your circuit.