Convert README.rst to README.md

Minor cleanup.

Author: daavoo

README.md

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+# Making point clouds fun again
+
+![pyntcloud logo](https://raw.githubusercontent.com/daavoo/pyntcloud/master/docs/images/pyntcloud_logo.png)
+
+
+**pyntcloud** is a Python library for working with 3D point clouds leveraging the power of the Python scientific stack.
+
+- [Examples](https://github.com/daavoo/pyntcloud/tree/master/examples).
+- [Documentation](http://pyntcloud.readthedocs.io/en/latest/)
+
+## Installation
+
+```bash
+pip install pyntcloud
+```
+
+## Quick Overview
+
+You can access most of pyntcloud's functionality from its core class: PyntCloud.
+
+With PyntCloud you can perform complex 3D processing operations with minimum lines of
+code. For example you can:
+
+- Load a PLY point cloud from disk.
+- Add 3 new scalar fields by converting RGB to HSV.
+- Build a grid of voxels from the point cloud.
+- Build a new point cloud keeping only the nearest point to each occupied voxel center.
+- Save the new point cloud in numpy's NPZ format.
+
+With the following concise code:
+
+```python
+from pyntcloud import PyntCloud
+
+cloud = PyntCloud.from_file("some_file.ply")
+
+cloud.add_scalar_field("hsv")
+
+voxelgrid_id = cloud.add_structure("voxelgrid", n_x=32, n_y=32, n_z=32)
+
+new_cloud = cloud.get_sample("voxelgrid_nearest", voxelgrid_id=voxelgrid_id, as_PyntCloud=True)
+
+new_cloud.to_file("out_file.npz")
+```
+
+## Integration with other libraries
+
+pyntcloud offers seamless integration with other 3D processing libraries.
+
+You can create / convert PyntCloud instances from / to many 3D processing libraries using the `from_instance` / `to_instance` methods:
+
+- [Open3D](https://www.open3d.org)
+
+```python
+import open3d as o3d
+from pyntcloud import PyntCloud
+
+# FROM Open3D
+original_triangle_mesh = o3d.io.read_triangle_mesh("diamond.ply")
+cloud = PyntCloud.from_instance("open3d", original_triangle_mesh)
+
+# TO Open3D
+cloud = PyntCloud.from_file("diamond.ply")
+converted_triangle_mesh = cloud.to_instance("open3d", mesh=True)  # mesh=True by default
+```
+
+- [PyVista](https://docs.pyvista.org)
+
+```python
+import pyvista as pv
+from pyntcloud import PyntCloud
+
+# FROM PyVista
+original_point_cloud = pv.read("diamond.ply")
+cloud = PyntCloud.from_instance("pyvista", original_point_cloud)
+
+# TO PyVista
+cloud = PyntCloud.from_file("diamond.ply")
+converted_triangle_mesh = cloud.to_instance("pyvista", mesh=True)
+```