274 add multi organ segmentation bundle (Project-MONAI#275)

Fixes Project-MONAI#274

### Description
Add multi-organ segmentation bundle for abdominal CT images.

### Status
**Ready**

### Please ensure all the checkboxes:
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Codeformat tests passed locally by running ./runtests.sh
--codeformat.
- [ ] In-line docstrings updated.
- [x] Update `version` and `changelog` in `metadata.json` if changing an
existing bundle.
- [x] Please ensure the naming rules in config files meet our
requirements (please refer to: `CONTRIBUTING.md`).
- [x] Ensure versions of packages such as `monai`, `pytorch` and `numpy`
are correct in `metadata.json`.
- [x] Descriptions should be consistent with the content, such as
`eval_metrics` of the provided weights and TorchScript modules.
- [x] Files larger than 25MB are excluded and replaced by providing
download links in `large_file.yml`.
- [x] Avoid using path that contains personal information within config
files (such as use `/home/your_name/` for `"bundle_root"`).

---------

Signed-off-by: monai-bot <monai.miccai2019@gmail.com>
Signed-off-by: Holger Roth <hroth@nvidia.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Yiheng Wang <68361391+yiheng-wang-nv@users.noreply.github.com>
Co-authored-by: Yiheng Wang <vennw@nvidia.com>
Co-authored-by: monai-bot <monai.miccai2019@gmail.com>
Co-authored-by: Holger Roth <hroth@nvidia.com>
Co-authored-by: Holger Roth <6304754+holgerroth@users.noreply.github.com>

models/multi_organ_segmentation/LICENSE

@@ -0,0 +1,3 @@
+Private Use, Non-Commercial, Non-Reverse-Engineering License
+
+The Licensee is not allowed to distribute or make the model to any third party, either for free or for a fee. Reverse engineering of the model is not allowed. This includes, but is not limited to, providing the model as part of a commercial offering, sharing the model on a public or private network, or making the model available for download on the Internet.