Add rule import guide to contribution file

Author: utarwyn

CONTRIBUTING.md

@@ -8,5 +8,5 @@ This repository contains multiple linters you can contribute to, depending on th
 for:
 
 - JavaScript/TypeScript linter, written as an ESLint plugin\
-  [Click here to read its dedicated contribution guide](https://github.com/green-code-initiative/ecoCode-linter/blob/main/eslint-plugin/CONTRIBUTING.md)
+  [Click here to read its dedicated contribution guide](eslint-plugin/CONTRIBUTING.md)
 - More to come..

README.md

@@ -15,6 +15,8 @@ the [main ecoCode repository](https://github.com/green-code-initiative/ecoCode/t
 > ⚠️ These plugins are in a very early stage and need improvements. Any contribution will be appreciated.
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+[![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](https://github.com/green-code-initiative/ecoCode-common/blob/main/doc/CODE_OF_CONDUCT.md)
+[![Sonar Quality gate](https://img.shields.io/sonar/quality_gate/green-code-initiative_ecoCode-linter?server=https%3A%2F%2Fsonarcloud.io)](https://sonarcloud.io/project/overview?id=green-code-initiative_ecoCode-linter)
 
 📣 Why linters?
 ----------------
@@ -38,7 +40,7 @@ Not available right now. Coming soon!
 If you don't want to integrate rules into SonarQube, you are free to do so.\
 Plugins are working nicely on their own! Follow instructions in the dedicated README files.
 
-- [JavaScript/TypeScript linter using ESLint](https://github.com/green-code-initiative/ecoCode-linter/blob/main/eslint-plugin/README.md)
+- [JavaScript/TypeScript linter using ESLint](eslint-plugin/README.md)
 - More to come..
 
 🛒 Distribution
@@ -53,5 +55,5 @@ You can follow changelogs on [GitHub Releases page](https://github.com/green-cod
 You have an idea or you want to help us improving these linters? \
 We are open to your suggestions and contributions! Open an issue or PR 🚀
 
-Check out the [CONTRIBUTING.md](https://github.com/green-code-initiative/ecoCode-linter/blob/main/CONTRIBUTING.md) file
+Check out the [CONTRIBUTING.md](CONTRIBUTING.md) file
 and follow the various guides to start contributing.

eslint-plugin/CONTRIBUTING.md

@@ -74,3 +74,20 @@ Two npm scripts are available:
 
 All the generated code is between commented lines with "auto-generated" in the text.\
 **Please run update script** after a rule creation.
+
+## Import a rule into the SonarQube plugin
+
+After being developed in the linter, a rule must be integrated into the SonarQube plugin in order to be displayed
+correctly with all its details. A tooling script makes this job very easy.
+
+1. Run the npm script `yarn run generate-sonar-rules`
+2. A file will be created at **"tools/generated-rules.json"**, copy its content
+3. Paste it into ecoCode project in file
+   **"javascript-plugin/src/main/resources/fr/greencodeinitiative/i10n/javascript/rules.json"**
+
+## End of development?
+
+The last step is to open a PR on this project with the implementation of the rule, and a second one on the ecoCode
+project with the list of updated rules. Keep an eye on the coverage of your rule implementation 👀
+
+This is the end of this guide, thank you for reading this far and contributing to the project 🙏.