updated readme

README.md

@@ -7,21 +7,33 @@ Some time ago I had a project where I rendered something to a high quality buffe
 
 Features
 --------
-* Output streams for bmp and png image files
+* Output streams for bmp, png and jpg image files
 * Grayscale and color
 * Low memory usage (because it streams)
 * Easy to use
 
-Uasge
+Usage
 -----
 ```C++
 png::gray_ostream image(1024, 768, "test.png");
 for(int y = 0; y < 768; ++y){
 	for(int x = 0; x < 1024; ++x){
-		image << png::gray_ostream::pixel(some_generation(x,y));
+		image << png::gray_ostream::pixel(some_generator(x,y));
 	}
 }
-// done, image is automatically saved (wtih RAII)
+// done, image is automatically saved (with RAII)
 ```
 
 There are more examples in the main.cpp file.
+
+Dependencies
+------------
+For the png format libpng is required. For the jpg format libjpeg or libjpeg-turbo is required. The bmp format does not depend on anything, so you can output images without other libraries :D.
+
+TODO
+----
+* Make output iterators
+* Add alpha support (where possible)
+* Some interface for parameters (eg. jpg quality)
+* Add appropriate license
+* Really make it a library (ie. restructure directories)