I was having a heck of a time finding info on the config format as well. Turns out the Quartz.Net source contains a nice sample App.config file in src/Quartz.Examples. It looks like the snippet below, except that I've omitted the Common.Logging configuration, which is explained in detail (with an example) in the Common.Logging documentation.
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="quartz" type="System.Configuration.NameValueSectionHandler, System, Version=1.0.5000.0,Culture=neutral, PublicKeyToken=b77a5c561934e089" />
</configSections>
<quartz>
<add key="quartz.scheduler.instanceName" value="ExampleDefaultQuartzScheduler" />
<add key="quartz.threadPool.type" value="Quartz.Simpl.SimpleThreadPool, Quartz" />
<add key="quartz.threadPool.threadCount" value="10" />
<add key="quartz.threadPool.threadPriority" value="2" />
<add key="quartz.jobStore.misfireThreshold" value="60000" />
<add key="quartz.jobStore.type" value="Quartz.Simpl.RAMJobStore, Quartz" />
</quartz>
</configuration>
J has a discussion of other configuration options in How Does Quartz.Net Configuration Work?, and I expect the best place to find a "complete" list of possible properties is the Java Quartz documentation that Andreas linked, though it should probably only be used as a guide to see Quartz.Net's potential rather than true documentation per se since there are at least a couple differences.