Update README.md

Author: leavauchier

README.md

@@ -18,11 +18,12 @@ Rasters can be (or not) colorized or shadowed using a digital surface/terrain mo
 ## Usage
 
 - Ctview has been developed using Linux Ubuntu and tested under linux and windows
-- CtView should be used as a command line tool (commands must be executed from ctview's root folder).
+- CtView should be used as a command line tool (commands must be executed from ctview's root folder)
 - It is intended to run on a single file (to use it on a folder, an external loop is required)
 - The configuration is handled via yaml files with [hydra](https://hydra.cc/docs/intro/)
-- A few commands for installation and tests are provided in a [Makefile](Makefile)  in the root folder
+- A few commands for installation and tests are provided in a [Makefile](Makefile) in the root folder
 - conda is used for environment building, pytest for testing
+- The entry point of the code is [ctview/main_ctview.py](ctview/main_ctview.py)
 
 # Version française (plus complète)