Add quelaton package javadoc

diff --git a/src/main/java/net/pterodactylus/fcp/quelaton/package-info.java b/src/main/java/net/pterodactylus/fcp/quelaton/package-info.java
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+++ b/src/main/java/net/pterodactylus/fcp/quelaton/package-info.java
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+/**
+ * Quelaton – a high-level FCP client with an easy-to-use fluent interface.
+ * <p>
+ * Quelaton can be used by FCP applications to easily perform the most commons tasks, such as retrieving or inserting
+ * data, or generating keys. The main entry class is {@link net.pterodactylus.fcp.quelaton.FcpClient} which can create
+ * FCP commands which can then be fed arguments or data and which can be executed, yielding a result in form of a
+ * {@link java.util.concurrent.Future}.
+ * <pre>
+ * FcpClient fcpClient = ...
+ * Optional&lt;Data&gt; data = fcpClient.clientGet().uri("KSK@gpl.txt").{@link java.util.concurrent.Future#get()
+ * get()};
+ * if (data.isPresent()) {
+ *     ... process data ...
+ * }
+ * </pre>
+ * <p>
+ * As is the case with {@link java.util.concurrent.Future}’s, the call to {@link java.util.concurrent.Future#get()}
+ * will block until the request has finished. This allows starting the request (by calling
+ * {@link net.pterodactylus.fcp.quelaton.ClientGetCommand#uri(String)}) and waiting for it to finish in a different
+ * thread. Using Guava’s {@link com.google.common.util.concurrent.ListenableFuture} allows client applications to
+ * register listeners that will automatically be run once the request finishes.
+ *
+ * @author <a href="mailto:bombe@freenetproject.org">David ‘Bombe’ Roden</a>
+ */
+package net.pterodactylus.fcp.quelaton;