wrote contributing document

CONTRIBUTING.md

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+# Contributing to nd2reader
+
+We welcome feature proposals and improvements to the library from anyone. If you just have an idea, you can open an [issue](https://github.com/jimrybarski/nd2reader/issues) for
+discussion, or get in touch with Jim Rybarski via email at jim@rybarski.com, or on Twitter at @jimrybarski. If you already wrote some code or made changes, simply open a pull
+request.
+
+# Easy Tasks for Beginners
+
+There are issues labeled `easy` which are small but useful tasks that are designed for people who are new to open source projects. If you'd like to work on one, feel free to just
+take one on, or get in touch if you need help.
+
+# Running and Writing Tests
+
+Unit tests can be run with the commands `python3.4 test.py` and `python2.7 test.py`. The test finder will automatically locate any tests in the `tests` directory. Test classes
+must inherit from `unittest.TestCase` and tests will only be run if the function name starts with `test`. If you've built the Docker image, you can also run unit tests with
+`make test` - this will conveniently run tests for all supported versions of Python.
+
+There are also functional tests that work with real ND2s to make sure the code actually works with a wide variety of files. We hope to someday put these into a continuous integration
+system so everyone can benefit, but for now, they will just be manually run by the maintainer of this library before merging in any contributions.
+
+# Contributing Your ND2 files
+
+We always appreciate more ND2s, as they help us find corner cases. Please get in touch using any of the means listed at the top of this page if you'd like to send one in.
+
+# Docker and Makefile Commands
+
+A Dockerfile is included to allow testing in a consistent environment. `make build` will build the image for you. Due to the large number of packages that it installs, it often
+fails due to a problem with the Debian servers - just try again if this happens. Once that's complete, you can run `make py2` or `make py3` to enter into a Python interpreter in
+the container to test things out manually. This assumes you have the directory `~/nd2s` - any ND2 files placed there will be available in the container at `/var/nds2`. You can
+view images with scikit-image with something like the code below:
+
+```
+from nd2reader import Nd2
+from skimage import io
+
+n = Nd2("/var/nd2s/my.nd2")
+io.imshow(n[37])
+io.show()
+```

README.md

@@ -141,24 +141,24 @@ Camera information can be accessed programmatically:
 2
 ```
 
-### Citation
-
-You can cite nd2reader in your research if you want:
+### Contributing
 
-```
-Rybarski, Jim (2015): nd2reader. figshare.
-http://dx.doi.org/10.6084/m9.figshare.1619960
-```
+If you'd like to help with the development of nd2reader or just have an idea for improvement, please see the [contributing](https://github.com/jimrybarski/nd2reader/issues) page
+for more information.
 
 ### Bug Reports and Features
 
 If this fails to work exactly as expected, please open an [issue](https://github.com/jimrybarski/nd2reader/issues).
 If you get an unhandled exception, please paste the entire stack trace into the issue as well.
 
-### Contributing
+### Citation
+
+You can cite nd2reader in your research if you want:
 
-Please feel free to submit a pull request with any new features you think would be useful. You can also create an
-issue if you'd just like to propose or discuss a potential idea.
+```
+Rybarski, Jim (2015): nd2reader. figshare.
+http://dx.doi.org/10.6084/m9.figshare.1619960
+```
 
 ### Acknowledgments