update demo readme
-### Usage
+* Please checkout [NiftyNet model zoo](https://cmiclab.cs.ucl.ac.uk/CMIC/NiftyNetExampleServer/blob/master/model_zoo.md) for demos and trained models.
-##### (a) Running the demos:
-Please see the `README.md` in each folder of this [directory](./demos) for more details.
+* Please checkout [NiftyNet documentation website](http://niftynet.readthedocs.io/en/dev/config_spec.html) for configuration file usage.
-
-##### (b) To run an application
-
-For example, to run a segmentation network <sup>(*)</sup>:
-``` sh
-# training
-net_segment train -c /path/to/customised_config
-# inference
-net_segment inference -c /path/to/customised_config
-```
-where `/path/to/customised_config` implements all parameters listed by running:
-```sh
-net_segment -h
-```
-please see [configuration](../config) documentations for more details and
-config file examples.
-
-Commandline parameters override the default settings defined in `/path/to/customised_config`.
-For example,
-``` sh
-# training
-net_segment train -c /path/to/customised_config --lr 0.1
-```
-Uses all parameter specified in `/path/to/customised_config` but sets the
-learning rate to `0.1`
-
- <sup>(*) Please note that these instructions are for a `pip`-installed NiftyNet.
-If you are using the NiftyNet command line interface from within the NiftyNet source code, please use `python net_segment.py [...]` (provided that the current working directory is the root folder of the NiftyNet repository clone) instead of `net_segment [...]`.
-</sup>
