Improve READMEs

rust/sea_battle_backend/README.md

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 # Sea battle backend
+[![Build Status](https://drone.communiquons.org/api/badges/pierre/SeaBattle/status.svg)](https://drone.communiquons.org/pierre/SeaBattle)
+[![Crate](https://img.shields.io/crates/v/sea_battle_backend.svg)](https://crates.io/crates/sea_battle_backend)
+[![Documentation](https://docs.rs/sea_battle_backend/badge.svg)](https://docs.rs/sea_battle_backend/)
 
-A backend server for the Sea Battle game.
+A backend HTTP server for the Sea Battle game. The binary included in
+this crate can be used to deploy a server that will allow players to
+connect to play together.
 
-A command-line client is available in the `sea_battle_cli_player` crate.
+The `actix-web` library is used to spawn HTTP server. The games are encapsulated
+inside websockets.
+
+An official server is running at https://seabattleapi.communiquons.org/
+
+## Installation
+You can install the backend using the following command:
+
+```bash
+cargo install sea_battle_backend
+```
+
+## Usage
+```bash
+sea_battle_backend -l 0.0.0.0:7000
+```
+
+> Note: a reverse-proxy must be used to protect
+
+## Client
+A command-line client is available in the [sea_battle_cli_player](https://crates.io/crates/sea_battle_cli_player) crate.