correct Readme.md and ci.yml

README.md

@@ -15,13 +15,15 @@ Changing the rounding mode was possible thanks to the implementation of the libr
 - [jinja2](https://jinja.palletsprojects.com/en/2.10.x/)
 - [pytest](https://docs.pytest.org/en/7.2.x/)
 
-## Installation for Linux 
+## Installation
 
 First clone the repository. 
 
 Then, go inside the repository then configure and build the project and finally run the tests.
 
-To do so, run via your command line on Linux or your powershell on Windows:
+## Installation for Linux 
+
+Run via your command line on Linux :
 
 ```shell
 cd [PENE repository]
@@ -32,7 +34,9 @@ make
 ctest -C Debug --output-on-failure
 ``` 
 
-## Installation for Windows 
+## Installation for Windows
+
+Run via your command line on your powershell on Windows :
 
 ```shell
 cd [PENE repository]