CentralBodyReferenceSystemBuilder.md

+# Central Body Reference System Builder
+
+The central body reference system builder aims at building a central body reference system and add parameters if wanted.
+
+You can use it like this : 
+
+```java
+final CentralBodyReferenceSystem system = CentralBodyReferenceSystem.builder().withColors(color1, color2, color3).withBody(body).build();
+```
+
+## Functions that you can add to the builder :
+
+`withColors`([Color](https://docs.oracle.com/javase/8/docs/api/java/awt/Color.html) color) - CentralBodyReferenceSystemBuilder : Add colors for the axis of the reference system.
+
+`withBody`([OneAxisEllipsoid](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/bodies/OneAxisEllipsoid.html) - CentralBodyReferenceSystemBuilder : Add a central body as a reference for the system.
+
+`withId(String id)` - CentralBodyReferenceSystemBuilder : Add an id for the central reference system.
+
+`withName(String name)` - CentralBodyReferenceSystemBuilder : Add a name for the central reference system.
+
+## The build function
+
+In order to generate the line of visibility don't forget to add the `build()` function.
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