add roadmap

Author: pcmoritz

ROADMAP.md

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+# Roadmap
+
+Here are the tasks we plan on working next. If you would like to contribute to
+one of them or have suggestions for more extensions you would like to see,
+please let us know!
+
+- Switch from RDDs to DataFrames
+- Make SparkNet a plug in replacement for MLlib's classification and regression algorithms
+- Switch from images to arbitrary tensors
+- Eliminate slowdown when Spark writes to disk
+- Experiment with more communication schemes (for example ElasticSGD)
+- Add examples for more models (for example RNNs)
+- Use JavaCPP to wrap Caffe
+- Wrap other deep learning libraries (TensorFlow, Torch)