Write basic readme with basic example usage

README.md

@@ -1,3 +1,41 @@
 # soundtrack.optical
 
-Library for generating optical soundtracks with Processing.
+Library for generating 16mm optical soundtracks with Processing.
+
+Install library by downloading library as .zip, uncompressing and placing SoundtrackOptical in your Processing library directory. Start up (or restart) Processing to use in a sketch.
+
+Supports mono audio only (at the moment, feel free to contribute).
+
+Draws various kids of 16mm soundtracks. [Read about them here.](http://www.paulivester.com/films/filmstock/guide.htm).
+
+* unilateral
+* *dual unilateral (in progress!)*
+* single variable area
+* dual variable area
+* multiple variable area (Maurer)
+
+### Example Usage
+
+```java
+import processing.sound.*;
+import soundtrack.optical.*;
+
+SoundtrackOptical soundtrack;
+
+String soundtrackFile = "./data/barking.wav";
+int dpi = 2400;
+float volume = 1.0;
+String type = "dual variable area";
+String pitch = "long";
+boolean positive = true;
+
+void setup() {
+  size(213, 620);
+  frameRate(24);
+  soundtrack = new SoundtrackOptical(this, soundtrackFile, dpi, volume, type, pitch, positive);
+}
+
+void draw () {
+  soundtrack.frame(0, 0);
+}
+```