Added CONTRIBUTING.md with all the necessary rules

CONTRIBUTING.md

@@ -0,0 +1,63 @@
+# How to Contribute
+
+Thank you for considering contributing. All contributions are welcome and
+appreciated!
+
+## Bug Reports
+
+> **Note:** Be sure to have censored any sensitive data before posting,
+> especially in the logs!
+
+**Github issues** is used for tracking bugs and proposing new features. Please
+consider the following when opening an issue:
+
++ Avoid opening duplicate issues by taking a look at the current open issues.
++ Provide details on the library version, operating system and Rust version you
+  are running.
++ Provide the **expected** and the **actual** behavior.
++ Provide steps to reproduce the issue
++ Include complete log tracebacks and error messages.
++ An optional description to give more context
+
+## Feature Proposal
+
+**Github issues** is used for tracking bugs and proposing new features. Please
+consider the following when opening an issue:
+
++ Avoid opening duplicate issues by taking a look at the current open and closed
+  ones.
++ The feature must be concrete enough to visualize, broken into parts, easy to
+  manage and the task not too heavy.
++ Provide a short description from the point of view the actor(s) who will
+  benefit from it, specifying what feature you want and what the actors should
+  achieve with it. In other words you have to **justify** why the feature can be
+  beneficial for the project.
++ Provide a list of acceptance criteria.
++ If you have clear ideas on how implement this feature write a checklist (not
+  too much precise but also not too much vague) on changes you have to bring to
+  the project.
++ To give more context you can optionally add a (not too long) description with
+  images attached.
+
+## Pull Requests
+
+All pull requests are welcome, but please consider the following:
+
++ **You cannot merge into master**.
++ Please open an issue first if a relevant one is not already open.
++ Include tests.
++ Include documentation for new features.
++ If your patch is supposed to fix a bug, please open an issue first.
++ Avoid introducing new dependencies.
++ Clarity is preferred over brevity.
++ Please follow `cargo check`.
++ Before the merge the code will be reviewed and should pass an acceptance
+  testing from other contributors and/or project leaders.
++ Provide a changelog (not too much detailed) about your changes
+
+> **Note:**
+>
+> + The merge requests to _master_ **_must only come from_** the _dev_ branch.
+> + In case an **hotfix** is necessary you can only _branch from master_, apply
+>   the fix (maybe cherry-picking from other branches) and then merge back to
+>   master.

README.md

@@ -24,6 +24,11 @@ cargo build
 
 That's all! ☕️
 
+## Contribute
+
+See [CONTRIBUTING.md](CONTRIBUTING.md) to know how to report bugs, propose
+features, merge requests or other forms of contribution! 😎🚀
+
 ## Testing & Linting
 
 To launch **tests**: