Added CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing
+
+<br/>
+
+## Who can contribute
+
+Everyone is welcome.
+
+<br/>
+
+## How to contribute
+
+*If you don't know how to contribute to a project, read the [GitHub Guidelines](https://docs.github.com/en/get-started/quickstart/contributing-to-projects) first.*
+
+<br/>
+
+If you want to contribute to LogDoctor, please follow these steps:
+
+  - Possibly open an **Issue** before to start, to declare what your contribution will be
+
+  - **Fork** the `devel` branch of this project
+
+  - **Improve** it with your ideas
+
+  - Submit a **Pull Request** to the same branch (`devel`)
+
+<br/>
+
+## Why the DEVEL branch
+
+It's related to the git system and mantainer's choice.<br/>
+The `main` branch contains website-specific contents, which differ from site to site, while the `devel` branch is (supposed) to be the same and to act as an indipendent base for the code (and hopefully to keep a linear history).<br/>
+As an example, if you push changes to the `main` branch on github, they won't appear as yours on gitlab (or whatever other site this repo is or will be hosted on) because the `devel` branch will never pull changes happened to `main`, so if you want your contribution to be part of the git repository indipendently from the platform, please follow the instructions.
+
+<br/>
+
+## Pull Requests
+
+When submitting a PR, please leave a message with it explaining which has been your changes.
+
+<br/>