Update README.md

add requirement

README.md

@@ -2,10 +2,18 @@ Raspberry Pi Framebuffer Copy
 =============================
 This program used for copy primary framebuffer to secondary framebuffer (eg. FBTFT). It require lastest raspberry pi firmware (> 2013-07-11) to working properly.
 
-Tested on Raspberry Pi
-======================
+Tested on Raspberry Pi 3
+========================
 2017-11-29-raspbian-stretch
 
+
+Requirement
+-----------
+cmake
+libatlas-base-dev
+
+$ sudo apt-get install cmake libatlas-base-dev -y
+
 Build
 -----
 
@@ -24,7 +32,7 @@ $ ./fbcp
 
 Wanna to run from booting
 -------------------------
-$ sudo cp fbcopy /usr/bin
+$ sudo cp fbcp /usr/bin
 $ sudo chmod +x /usr/bin/fbcp
 $ sudo nano /etc/rc.local -> add new line before "exit 0" with "/usr/bin/fbcp &" without quote
 $ sudo reboot