contribution.md file added

Author: maceto

Diff for: CONTRIBUTING.md

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+# Contributing to Tech Report APIs
+
+## Where do I go from here?
+
+If you've noticed a bug or have a feature request, make sure to check our [issues](https://github.com/HTTPArchive/tech-report-apis/issues) if there's something similar to what you have in mind. If not, you can open a new issue and provide as much detail as possible about what you'd like to see or what problem you're experiencing.
+
+## Fork & create a branch
+
+If this is something you think you can fix, then fork the repository and create a branch with a descriptive name.
+
+A good branch name would be (where issue #325 is the ticket you're working on):
+
+```bash
+git checkout -b feature/325-add-japanese-localisation
+```
+
+## Implement your fix or feature
+
+At this point, you're ready to make your changes! Feel free to ask for help; everyone is a beginner at first.
+
+## Write a good commit message
+
+A good commit message serves at least three important purposes:
+
+- To speed up the reviewing process.
+- To help us write a good release note.
+- To help the future maintainers of Project Name (it could be you!), say five years into the future, to find out why a particular change was made to the code or why a specific feature was added.
+
+Here's an example of a good commit message structure:
+
+```bash
+Short (50 chars or less) summary of changes
+
+More detailed explanatory text, if necessary.  Wrap it to about 72
+characters or so.  In some contexts, the first line is treated as the
+subject of an email and the rest of the text as the body.  The blank
+line separating the summary from the body is critical (unless you omit
+the body entirely); tools like rebase can get confused if you run the
+two together.
+
+Further paragraphs come after blank lines.
+
+- Bullet points are okay, too
+
+- Typically a hyphen or asterisk is used for the bullet, followed by a
+  single space, with blank lines in between, but conventions vary here
+
+- Use a hanging indent
+```
+
+## Submit a pull request
+
+Once you've pushed your branch to your fork, you're ready to submit a pull request. We recommend opening a pull request early, and marking it as "Work in Progress" (prefix the title with `WIP:`), so that you can receive feedback early.
+
+## Keeping your Pull Request updated
+
+If a maintainer asks you to "rebase" your PR, they're saying that a lot of code has changed, and that you need to update your branch so it's easier to merge.
+
+To update your pull request, follow these steps:
+
+1. `git fetch origin`
+2. `git rebase origin/main`
+3. `git push --force-with-lease origin <your-branch>`
+
+Thank you for your contributions!