Markdown corrections in README.md and CONTRIBUTING.md

Author: Tim-ats-d

CONTRIBUTING.md

@@ -1,13 +1,13 @@
 
-# Contributing
+# Contributing
 
 ## Setup your development environment
 
 You need:
 * `Python3.6`: you can install it by following [Python3's documentation](https://www.python.org/downloads/).
 * `curses`: available in standard library of `Python` but it doesn't work out-of-the-box on Windows. See [this](https://www.devdungeon.com/content/curses-windows-python) explanations to install `curses` on Windows.
 
-## Branches
+## Branches
 
 * main : stable releases.
 
@@ -31,7 +31,7 @@ python3 -m pip install git+git://github.com/Tim-ats-d/Visual-dialog --upgrade
 ```
 The list of versions and their changelogs can be found [here](https://github.com/Tim-ats-d/Visual-dialog/releases/).
 
-## Repository Structure
+## Repository Structure
 
 The following snippet describes Visual-dialog's repository structure.
 

README.md

@@ -8,7 +8,7 @@
   <a href="#features">Features</a> •
   <a href="#installation">Installation</a> •
   <a href="#documentation">Documentation</a> •
-  <a href="#quick-start ">Usage</a> •
+  <a href="#quick-start">Quick start</a> •
   <a href="#contributing">Contributing</a> •
   <a href="#license">License</a>
 </p>
@@ -28,7 +28,10 @@
 ## Installation
 
 ### Using pip
-`pip install git+git://github.com/Tim-ats-d/Visual-dialog`
+
+```bash
+python3 -m pip install git+git://github.com/Tim-ats-d/Visual-dialog
+```
 (The lib is not yet available on **pypy**).
 
 ### Requirements