PCI-E 1x Riser Card Bracket

Wanted to use pci-e cards outside of my small computer. The riser card did not have a bracket to keep it secure in the closed case so I've designed one. Maybe there is someone else who is looking to do this as well.

Source is provided.

#### Dependencies

To use this design, the following one-time setup is required. This will install several packages, so you may wish to experiment on a virtual machine first. *(NOTE: an X server graphics environment is required and this build process has been tested on debian and ubuntu Linux)*.

> $ wget http://git.io/setup-omdl.bash && chmod +x setup-omdl.bash
>
> $ ./setup-omdl.bash --branch v0.6.1 --no-excludes --yes --install

This will take a while to test the [omdl] library and build its [documentation]. Once complete, the library documentation will have been installed and can be viewed with the web browser of your choice:

> $ google-chrome ${HOME}/.local/share/OpenSCAD/docs/html/index.html


[omdl]: https://royasutton.github.io/omdl/
[reposito