Create README.md

Author: Macoron

README.md

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+# Unity Ply Export
+Export ASCII [.ply files](https://en.wikipedia.org/wiki/PLY_(file_format)) from Unity3d editor or runtime. 
+
+Supports both pointclouds and polygonal meshes.
+
+## Setup
+You can install this package using **Package Manager**. Add it by this git URL:
+```
+https://github.com/Macoron/Unity-Ply-Export.git
+```
+
+**Alternatively** just clone or download zip ot this repo and place it somewhere in your Assets folder.
+
+## Examples
+Export mesh model into .ply file:
+```csharp
+var meshFilter = GetComponent<MeshFilter>();
+var ply = PlyExport.ToPly(meshFilter);
+File.WriteAllText("mesh.ply", ply);
+```
+
+Export pointcloud into .ply file:
+```csharp
+var points = new List<Vector3>();
+for (int i = 0; i < 1000; i++)
+    points.Add(Random.insideUnitSphere);
+
+var ply = PlyExport.ToPlyPointcloud(points.ToArray());
+File.WriteAllText("pointcloud.ply", ply);
+```
+
+## Limitations
+Keep in mind that not all data is supported for export:
+- [x] Colored pointclouds
+- [x] Polygonal mesh
+- [x] Mesh vertex colors
+- [ ] Mesh vertex normals
+- [ ] Mesh materials
+- [ ] Mesh UV
+
+## License
+This project is licensed under the MIT License.