README - Add instructions about Armadillo

README.md

@@ -13,7 +13,8 @@ This work was in part supported by the DexROV project through the EC H2020 progr
 
 ### Prerequisite
 
-The program requires glfw3 (lightweight and portable library for managing OpenGL contexts, windows and inputs). 
+The program requires glfw3 (lightweight and portable library for managing OpenGL contexts, windows and inputs) and
+Armadillo (C++ library for linear algebra & scientific computing). Instructions are given below.
 
 ImGui (graphical user interface library for C++, [https://github.com/ocornut/imgui](https://github.com/ocornut/imgui)) and
 gfx_ui (a minimal geometry editing UI, [https://github.com/colormotor/gfx\_ui](https://github.com/colormotor/gfx_ui)), are also
@@ -33,12 +34,14 @@ make
 
 ### glfw3 installation
 
-On Debian:
+**On Debian:**
 
 ```
 sudo apt-get install libglfw3-dev 
 ```
 
+**Installation from source**
+
 If libglfw3-dev is not available on your system, you can install it manually with:
 
 ```
@@ -52,10 +55,16 @@ sudo make install
 export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
 ```
 
-**Note:** The `-DBUILD_SHARED_LIBS` is necessary otherwise cmake will create a
+*Note:* The `-DBUILD_SHARED_LIBS` is necessary otherwise cmake will create a
 static library.
 
 
+### Armadillo installation
+
+See [http://arma.sourceforge.net/download.html](http://arma.sourceforge.net/download.html)
+for instructions.
+
+
 ### References and list of examples
 
 See [https://gitlab.idiap.ch/rli/pbdlib-cpp/blob/master/examples.md](https://gitlab.idiap.ch/rli/pbdlib-cpp/blob/master/examples.md)