Merge pull request #1 from traversaro/add-xacro

Add xacro

README.md

@@ -10,7 +10,7 @@ See the [official ROS documentation page on URDF](http://wiki.ros.org/urdf) for
 
 - [URDF](#urdf)
   - [Libraries](#libraries)
-    - [C++](#c-1)
+    - [C++](#c)
     - [Python](#python)
     - [MATLAB/Simulink](#matlabsimulink)
     - [Rust](#rust)
@@ -45,8 +45,10 @@ Libraries to import, export and manipulate URDF files.
 - [MeshCatMechanisms.jl](https://github.com/JuliaRobotics/MeshCatMechanisms.jl) - 3D Visualization of mechanisms and URDFs using [MeshCat.jl](https://github.com/rdeits/MeshCat.jl) and [RigidBodyDynamics.jl](https://github.com/JuliaRobotics/RigidBodyDynamics.jl) . [MIT]
 
 ### Tools
-- [blender-robotics-utils](https://github.com/robotology/blender-robotics-utils) Set of utilities for exporting/controlling your robot in [Blender](https://www.blender.org/). It includes a URDF to Blender model converter. [BSD]
-- [Unity-Technologies/URDF-Importer](https://github.com/Unity-Technologies/URDF-Importer) URDF Importer allows you to import a robot defined in URDF format in a [Unity scene](https://unity.com). [APACHE]
+
+- [xacro](https://github.com/ros/xacro) - Xacro is an XML macro language. With xacro, you can construct shorter and more readable XML files by using macros that expand to larger XML expressions. Xacro is frequently used to mantain URDF models. [BSD]
+- [blender-robotics-utils](https://github.com/robotology/blender-robotics-utils) - Set of utilities for exporting/controlling your robot in [Blender](https://www.blender.org/). It includes a URDF to Blender model converter. [BSD]
+- [Unity-Technologies/URDF-Importer](https://github.com/Unity-Technologies/URDF-Importer) - URDF Importer allows you to import a robot defined in URDF format in a [Unity scene](https://unity.com). [APACHE]
 
 ## Community