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ARROW-295: [Documentation] Add DOAP file

Hi,

Went to have a look at the [Apache Project listing](https://projects.apache.org/projects.html?language) and couldn't find Arrow there, so quickly grabbed Avro's DOAP, compared with a few Commons' DOAP files, and here's the result.

Notes:

- Use GitHub instead of git-wip (as far as I know, [git-wip is EOL](https://blogs.apache.org/infra/entry/relocation-of-apache-git-repositories), and all projects have to migrate to GitBox).
- Couldn't find a Wikipedia page for Arrow. That's where I normally find when the project was created, so used the [TLP project announcement](https://blogs.apache.org/foundation/entry/the_apache_software_foundation_announces87) date for the project `created` value.
- Use README's list of programming languages to create the list in this DOAP file.
- Some projects include updating DOAP release notes during/after the release, but it is not mandatory, and some (most?) ASF projects have outdated dates for the release in their DOAP files... having a DOAP file with valid metadata is still useful.

Happy to update branch it if necessary.

Other comments:

- Validated with W3C RDF validator, looks OK
- Built site locally and pushed to my fork to test that the DOAP file appeared correctly in the [browser](https://kinow.github.io/arrow/arrow.rdf). Basically, by having the file in the `site` directory and not including it in the `_config.yaml` to be excluded seems to be enough
- If/once merged, the ASF project listing would still lack Arrow. That's because someone (a PMC or committer) still needs to follow the [documentation for projects](https://projects.apache.org/create.html) and updated the [ASF SVN XML](https://svn.apache.org/repos/asf/comdev/projects.apache.org/trunk/data/projects.xml) used. But that's just one line, pointing to http://arrowapache.org/arrow.rdf

Cheers
Bruno

Author: Bruno P. Kinoshita <kinow@users.noreply.github.com>

Closes #3307 from kinow/add-doap-file and squashes the following commits:

d92566e9f <Bruno P. Kinoshita> ARROW-295: Add Matlab, and update release date/version
2c8b23ef9 <Bruno P. Kinoshita> ARROW-295: add DOAP file