Updated readme

README

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-noccylabs/lpr
-=============

README.md

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+noccylabs/lpr
+=============
+
+This is a library to make it easier to work with the `lpr` tool to print
+documents and images from code.
+
+## Installing
+
+Install using composer:
+
+    $ composer require noccylabs/lpr
+
+## Using
+
+The `PrintJob` class is used to create new jobs. Create an instance, passing
+the name of the document or image to print to the constructor, and then
+set your options. Finally, `submit()` the job to the printer.
+
+    use NoccyLabs\Lpr\PrintJob;
+
+    $job = new PrintJob("image.png");
+
+    // Configure
+    $job->setPrinter("MyPrinter");
+    $job->setMedia("A4");
+
+    // Additional options can be set like this
+    $job->setOption("fit-to-page", true);
+
+    // Invoke lpr to print the image
+    $job->submit();