write roadmap

README.md

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 # rubyplot
 An advanced plotting library for Ruby.
+
+# Roadmap
+
+The library in its current form is heavily under development.
+
+Here's the roadmap for rubyplot for the near future. Please write a mail to the sciruby ML
+or open an issue if you feel something is amiss:
+
+## Near future
+
+* Finish integration of rmagick and GR backends.
+* Creating  an Artist layer on RMagick based on GR Framework (The current 
+necessary functions are included in GR FunctionClasses file in Rubyplot-GR) 
+and integrating it with the existing scripting layer.
+* Integrate with nmatrix/plures.
+* Write tutorials and documentation.
+* Addition to events sub-layer in the backend layer.
+* Further development of scripting layer for additional features.
+* Make new plots on a priority basis. Here's the list: https://github.com/SciRuby/rubyplot/issues/4
+
+## Long term
+
+* Integrate with iruby notebook, daru, statsample, rb-gsl, etc.
+* Integrate with red data tools projects like charty, red-chainer, etc.
+* Integrate with QT/web front end to provide widget support etc.
+