update documentation, CBICA#151

Plugins/upenn.cbica.captk.brain.pseudoprogression/documentation/UserManual/Manual.dox

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+
+/**
+\page upenn_cbica_captk_brain_pseudoprogression PseudoProgression Estimator
+
+This plugin offers a convenient way to directly train or run pseudoprogression estimation on input subjects.
+Under the Brain category, click the pseudoprogression estimation icon to open the plugin view. 
+Select whether you wish to use an existing model to make a prediction OR to train a new model on subjects.
+If using an existing model, select the source. The CBICA CaPTk model is included; you may also use a custom model by specifying the directory.
+Select a directory in which to place output. This directory will be populated with results (if running) or model files (if training).
+Click the Run PseudoProgression estimation button. 
+When the pseudoprogression estimation is finished, you will be notified that the output has been saved.
+
+*/