import docs and code

docs/src/about.md

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+# About
+
+This page contains some general information about this project, and recommendations
+about contributing.
+
+```@contents
+Pages = ["about.md"]
+```
+
+## Contributing
+
+If you like this package, consider contributing! You can send bug reports (or fix them
+and send your code), add examples to the documentation or propose new features.
+
+Below we detail some of the guidelines that should be followed when contributing
+to this package.
+
+### Branches
+
+Each pull request (PR) should be pushed in a new branch with the name of the author
+followed by a descriptive name, e.g. `t/mforets/my_feature`. If the branch is
+associated to a previous discussion in one issue, we use the name of the issue for easier
+lookup, e.g. `t/mforets/7`.
+
+### Unit testing and continuous integration (CI)
+
+This project is synchronized with Travis CI, such that each PR gets tested
+before merging (and the build is automatically triggered after each new commit).
+
+For the maintainability of this project, we try to understand and fix the failing
+doctests if they exist. We develop in Julia v0.6.0, but for experimentation
+we also build on the nightly branch.
+
+To run the unit tests locally, you should do:
+
+```julia
+$ julia --color=yes test/runtests.jl
+```
+
+### Contributing to the documentation
+
+This documentation is written in Markdown, and it relies on
+[Documenter.jl](https://github.com/JuliaDocs/Documenter.jl) to produce the HTML
+layout. To build the docs, run `make.jl`:
+
+```julia
+$ julia --color=yes docs/make.jl
+```
+
+## Credits
+
+These persons have contributed to `PolynomialZonotopes.jl` (in alphabetic order):
+
+- [Marcelo Forets](http://marcelo-forets.fr)
+- Nikolaos Kekatos
+- [Christian Schilling](http://swt.informatik.uni-freiburg.de/staff/christian_schilling/)