Update README.md

Author: jpcima

README.md

@@ -4,6 +4,8 @@ This pd-visualization package provides Pure Data externals for visualizing signa
 
 These visualizers run in external processes and do not disturb real-time signal processing.
 
+A standalone version for the Jack Audio Connection Kit is also part of the package.
+
 ![patch](docs/patch.png)
 
 The bang message is used to show or hide the visualizer window. By default the visualizer is not started.
@@ -14,6 +16,15 @@ Platform compatibility:
 - Windows
 - probably Darwin, testing is needed
 
+To build the project, follow the usual CMake command line steps. The built puredata externals are located in the project directory, and the standalone versions are installed on the system. To use this in Pure Data, add the directory of this project to the search paths in preferences.
+
+```
+mkdir build ; cd build
+cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr/local ..
+make
+sudo make install
+```
+
 ## wfvisu~
 
 This visualization shows a waterfall view of the DFT of the input.