#35 Updates CONTRIBUTING.md to help developers lo launch the project …

…in local machines

CONTRIBUTING.md

@@ -2,6 +2,7 @@
 
 <p align="center">
 <a href="#best-practices">Best practices</a> ·
+<a href="#quickstart">Quickstart</a> ·
 <a href="#pull-request-process">Pull request process</a> ·
 <a href="#code-of-conduct">Code of conduct</a>
 </p>
@@ -29,6 +30,48 @@ project. We encourage you to follow them and help us create a better product!
 - Create commit messages that briefly describe the change applied, preferably in
   English.
 
+## Quickstart
+
+### Dependencies
+
+To install dependencies, after cloning the repository, run:
+
+```bash
+npm install
+```
+
+### Clean
+To clean output & build path run:
+
+```bash
+npm run clean
+```
+
+### Build
+
+To build the application, run: 
+
+```bash
+npm run build
+```
+
+
+### Usage
+To execute the application run: 
+
+```bash
+npm start -- -i input/file.yaml
+```
+
+You can find all the options in our [README](./README.md) file
+
+### Putting all together
+When you are developing a new feature you must clean output & build path, rebuild the app and execute it. So this is a good command to _remember_:
+
+```bash
+npm run clean && npm run build && npm start -- -i input/file.yaml
+```
+
 ## Pull request process
 
 1. Ensure any install or build dependencies are solved before doing a build.

README.md

@@ -7,6 +7,7 @@
 <p align="center">
 <a href="#-summary">Summary</a> ·
 <a href="#-getting-started">Getting started</a> ·
+<a href="#-contributing">Contributing</a> ·
 <a href="#-support">Support</a> ·
 <a href="#license">License</a>
 </p>
@@ -55,13 +56,17 @@ Options:
   -h, --help                shows this help
 ```
 
+## 🤝 Contributing
+
+If you want to collaborate with the project, please read our [CONTRIBUTING.md](./CONTRIBUTING.md) where you can find our guidelines
+
 ## 🧰 Support
 
 We’ll be glad to talk and discuss how `openapi-nodejs-cli` can help you 😊
 
 Reach us through [GitHub issues](https://github.com/corunet/openapi-nodejs-cli/issues), [email](mailto:[email protected]) or [Twitter](https://twitter.com/corunet).
 
-## License
+## 🔐 License
 
 This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at [https://mozilla.org/MPL/2.0/](https://mozilla.org/MPL/2.0/).
 [![License: MPL 2.0](https://img.shields.io/badge/License-MPL%202.0-brightgreen.svg)](https://github.com/corunet/openapi-nodejs-cli/blob/main/LICENSE)