Gazebo Harness Example

This example relies on the `worlds/harness.world` to lower an object in a
controlled manner.

===================
Build Instructions
===================

 * From this directory:

  $ mkdir build
  $ cd build
  $ cmake ..
  $ make


===================
Execute Instructions
===================

1. Launch gazebo using the harness.world:

```
gazebo worlds/harness.world
```

1. From this build directory, run `harness` and provide a target velocity

```
$ ./harness -0.1
```
