Add CONTRIBUTION.md. Some changes in README.md (edit pip command to install lib). Edit .gitignore

Author: Tim-ats-d

CONTRIBUTING.md

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+
+# 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
+
+* main : stable releases.
+
+To fix a minor problem or add new features create a new branch in this form: `username-dev`.
+Please test your code with `Python3.6` version before **pull request** to be sure not to break compatability.
+
+## Download
+
+Download projet:
+```bash
+git clone https://github.com/Tim-ats-d/Visual-dialog
+```
+
+Install Visual-dialog using `pip`:
+```bash
+python3 -m pip install git+git://github.com/Tim-ats-d/Visual-dialog
+```
+or update lib to the latest version:
+```bash
+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
+
+The following snippet describes Visual-dialog's repository structure.
+
+```text
+.
+├── .github/
+|   Contains Github specific files such as actions definitions and issue templates.
+│
+├── doc/
+|   Contains documentation.
+│   │
+│   ├── examples/
+│   │   Contains several examples of how to use Visual-dialog.
+│   │
+│   └── documentation.md
+│       Documentation of public API (coming soon).
+│
+├── visualdialog/
+|   Source for Visual-dialog's library.
+│   │
+|   ├── __init__.py
+│   │
+|   └── core.py
+|       Contains Visual-dialog's core functionnalities.
+│
+├── LICENSE
+│
+├── CONTRIBUTING.md
+│   This document.
+│
+├── MANIFEST.in
+│   Contains list of non Python file.
+│
+├── README.md
+│
+└── setup.py
+    Installation of the library.
+```