Update README.md

Author: mallamanis

README.md

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-Machine Learning for Big Code and Naturalness
-###
+## Machine Learning for Big Code and Naturalness
+
+
 This is the repository for the Survey of Machine Learning for Big Code and Naturalness.
 Please look at the [website](https://ml4code.github.io) for more information about
-the survey and for information about contributing your work or taxonomy to the website.
+the survey and for information about contributing your work or taxonomy to the website.
+
+
+### Contributing
+
+This research area is evolving so fast that a static review cannot keep up.
+But a website can! We hope to make this site a living document.
+Anyone can add a paper to this web site, essentially by creating one Markdown file.
+ To contribute, open a pull request in GitHub, by following [these instructions 
+for contributing](contributing.html).