Close #7 - Add FindADIOS.cmake Script from PIConGPU

This commit adds a slightly modified and re-licensed (BSD) version of the `FindADIOS.cmake` module from [PIConGPU](https://github.com/ComputationalRadiationPhysics/picongpu).

The module checks for all dependencies provided by `adios_config`, please check the module help for further information.

I guess this GitHub repository is only a cloned repo from your "real" mainline.
So you could follow this work-flow to keep the git history ("my commit") in shape when modifying the script (without the need to accept the pull request itself):

```bash
# go to your working directory
# ...
# add this repo to your remotes
git remote add axel git@github.com:ax3l/ADIOS.git
git fetch axel

# branch from this pull request branch and modify at will
git checkout -b topic-cmakeModuleModified axel/topic-cmakeModule

# modify, commit[, rebase] ... merge :)
```

Just a last side note:
>  @jyamu commented in https://github.com/ornladios/ADIOS/issues/7#issuecomment-37653188
> [...] If you don't mind, could you give us the cmake script such that we can push it to the repo and add more dependencies to it?

We are not sure if further modification is even necessary, since this script parses *all the dependencies* already provided by `adios_config`. But of course, a wide range of tests for further dependencies might be necessary.


Best greetings from Dresden Germany,
@ax3l and @f-schmitt-zih