added rustfmt: a rustfmt.toml file diescribing syntax (soft tabs of 2 spaces), a CONTRIBUTING.md file to explain how to use rustfmt, a .drone.yml file to add code style checks in CI, 2 lines in README.md to present CONTRIBUTING.md, and applied rustfmt on the source

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+# Contributing to Diplonat 
+
+## Development guidelines
+
+### Code formatting 
+
+[Our CI pipeline](./.drone.yml) features a verification of the code format, using [rustfmt](https://github.com/rust-lang/rustfmt).
+
+#### Installing rustfmt
+
+You can run `rustfmt` with Rust 1.24 and above.
+
+To install: 
+
+```
+rustup component add rustfmt
+```
+
+#### Usage 
+
+To run on Diplonat, launch the following in the root directory:
+
+```
+cargo fmt --all
+``` 
+
+This will format the whole repository using the settigs defined in [`.rustfmt.toml`](./.rustfmt.toml): soft tabs of 2 spaces.
+
+#### Auto-format code
+
+You can automate formatting in a number of ways:
+
+* [Setup your IDE to use `rustfmt`](https://github.com/rust-lang/rustfmt#running-rustfmt-from-your-editor).
+* Setup a git hook to run `rustfmt` before each commit.