docs: add class on keyboards

Change-Id: I3fb179457af50eec9d111f84eb9fabf49bc7ab1b
diff --git a/docs/html/training/best-user-input.jd b/docs/html/training/best-user-input.jd
new file mode 100644
index 0000000..7f5ed15
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+++ b/docs/html/training/best-user-input.jd
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+page.title=Best Practices for User Input
+page.trainingcourse=true
+
+@jd:body
+
+
+
+<p>These classes cover various subjects of user input, such as
+touch screen gestures and text input through on-screen input methods and hardware keyboards.</p>
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