Update README and add screenshot.

README.md

@@ -1,33 +1,35 @@
 # imgify - Convert any file to PNG and back
 
+![Screenshot](/screenshot.png?raw=true "screenshot")
+
+## Install dependencies
+
+Install `libpng`:
+
+- Debian, Ubuntu
+
+	`sudo apt-get install -y libpng-dev`
+
+- CentOS, Fedora, RedHat
+
+	`sudo yum install libpng-devel`
+
+## Get the source and compile
+
+	git clone https://github.com/jweyrich/imgify.git
+	cd imgify
+	make
+
 ## Usage
 
 ### bin2png
 
 	usage: bin2png -i <in_filename> -o <out_filename> [-p <pad_byte>]
 
-Example:
-
-	./bin2png -i /mach_kernel -o mach_kernel.png
-	Input file => /mach_kernel
-	  size => 8394688 bytes
-	Output file => mach_kernel.png
-	  size => 4524970 bytes
-	  image => 1449x1449 px, 32 bpp, 929px padding
-
 ### png2bin
 
 	usage: png2bin -i <in_filename> -o <out_filename> [-p <pad_byte>]
 
-Example:
-
-	./png2bin -i mach_kernel.png -o mach_kernel.bin
-	Input file => mach_kernel.png
-	  size => 4524970 bytes
-	  image => 1449x1449 px, 32 bpp, 929px padding
-	Output file => mach_kernel.bin
-	  size => 8394688 bytes
-
 ## License
 
-imgify is distributed under a GPL V2 licence. See the LICENSE file for more information.
+imgify is distributed under a GPL V2 licence. See the LICENSE file for more information.