ab: update readme

README.md

@@ -5,7 +5,7 @@ The slider cranck mechanism is a classical linkage assembly that transforms a ro
 
 The mechanism is made of a frame(0), an eccentric (1), a connecting rod (2) and a slider (3) depicted by the following figure:
 
-![image](.readme_images/linkage_slider_cranck_mech.png)
+![img](.readme_images/linkage_slider_cranck_mech.png)
 
 This application aims to illustrate the kinematics of the mechanism. It replicates a free software that was available on MECAMEDIA but which is not maintained. It also exists a [MatLab version](https://github.com/mahmoudsamhoud/Cranck-Slider-Mechanism-Computational-Dynamics-). 
 
@@ -16,4 +16,15 @@ Besides it illustrates some graphical kinematics tools such as trajectories, vel
 
 The application works with python37 and the required packages are: numpy and matplotlib
 
+To run the application, you might either:
+* double click on `slider-cranck_mechanism_app.py` if you have a python interpreter set with the right version and libraries;
+* in a terminal run the following command :
+```
+python slider-cranck_mechanism_app.py
+```
+
+**Configuration and plots are not automatically updatedwhen settings are changed. 
+You always have to modify the time position to observe the updates**
+
+
 Perspectives are to show instantaneous center of rotation as well as their trajectories. The vector representation could also be improved.
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