chore(CONTRIBUTING.md): introduce (#18)

Author: AugustinMauroy

Diff for: CONTRIBUTING.md

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+# nodejs-loaders.github.io Contributing Guide
+
+Thank you for considering contributing to Node.js Loaders website! Contributions welcome, be they bug reports, feature requests, pull requests, or just questions.
+
+## Getting started
+
+Commands specifically relevant to this project are:
+
+Run the frontend unit tests:
+
+```bash
+node --run test:unit
+```
+
+Lint, format, and check types can be handled by:
+
+```bash
+node --run pre-commit
+```
+
+## Writing Content (Posts)
+
+To contribute a new post, create a new `.mdx` file in the `content/post/` directory. The file should include the following frontmatter:
+
+- `title`: The title of the post (string).
+- `description`: A brief description of the post (string).
+- `authors`: An array of author names (string).
+- `date`: The date of the post in `YYYY-MM-DD` format (string).
+- `category`: The category of the post (string).
+
+Here's an example:
+
+```mdx
+---
+title: Your Post Title
+description: A brief description of your post.
+authors: YourName
+date: 2025-02-07
+category: example
+---
+```
+
+Your post content goes here. You can use Markdown and JSX.
+
+## Pull Requests
+
+Changes should be atomic; do not combine multiple, discrete changes within a single PR.
+
+We use [squash merge](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/incorporating-changes-from-a-pull-request/about-pull-request-merges#squash-and-merge-your-commits) to create a single fresh commit based on PR title. The PR title should follow [Conventional Commit guidelines](https://www.conventionalcommits.org/en/v1.0.0/). Acceptable "types" are:
+
+Before a pull request is merged, the following requirements should be met:
+
+- The pull request has a descriptive title and follows the commit message guidelines.
+- An approval is valid if there have been no major changes since it was granted.
+- 24 hours after approval and no objections, the pull request can be merged.
+- All tests pass (Github actions).
+
+## [Developer's Certificate of Origin 1.1](https://developercertificate.org)
+
+```txt
+By contributing to this project, I certify that:
+
+- (a) The contribution was created in whole or in part by me and I have the right to
+  submit it under the open source license indicated in the file; or
+- (b) The contribution is based upon previous work that, to the best of my knowledge,
+  is covered under an appropriate open source license and I have the right under that
+  license to submit that work with modifications, whether created in whole or in part
+  by me, under the same open source license (unless I am permitted to submit under a
+  different license), as indicated in the file; or
+- (c) The contribution was provided directly to me by some other person who certified
+  (a), (b) or (c) and I have not modified it.
+- (d) I understand and agree that this project and the contribution are public and that
+  a record of the contribution (including all personal information I submit with it,
+  including my sign-off) is maintained indefinitely and may be redistributed consistent
+  with this project or the open source license(s) involved.
+```