docs: contributing guides

CONTRIBUTING.md

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+# Contributing
+
+Contributions are always welcome, here's an instruction of how to contribute.
+
+## Local setup
+
+### Install
+
+- Clone the repo first:
+
+```sh
+# git
+git clone https://github.com/tinyhttp/malibu.git
+
+# (or) hub
+hub clone tinyhttp/malibu
+```
+
+- Install Node.js (v14 is recommended) and `pnpm`:
+
+```sh
+# Install fnm
+curl -fsSL https://github.com/Schniz/fnm/raw/master/.ci/install.sh | bash
+
+# Install latest Node.js version
+fnm install latest
+fnm use latest
+
+# Install pnpm
+curl -L https://raw.githubusercontent.com/pnpm/self-installer/master/install.js | node
+
+# Or, via npm
+npm i -g pnpm
+```
+
+- Install the dependencies at root and in the packages:
+
+```sh
+pnpm i
+```
+
+### Formatting
+
+If you use VS Code, please install Prettier and ESLint plugins for proper linting and code formatting.
+
+If you use a text editor that doesn't have Prettier integration, you can run `pnpx format:fix"`
+
+## Submitting PRs
+
+### General rules
+
+Here's a small list of requirements for your PR:
+
+- it should be linted and formatted properly using configurations in the root
+- it should build without errors and warnings (except edge cases)
+- it should have been tested
+- PR must have a clear description of what it does, which part of the repo it affects
+- if PR is adding a new middleware, it should have an example in the description.
+
+### Adding new example
+
+- Create a folder with the package name in `examples` folder
+- Create `package.json` with these fields:
+
+```json
+{
+  "name": "<name>",
+  "type": "module",
+  "module": "index.js"
+}
+```
+
+- create `index.js` (or `index.ts`) file
+- create some cool example
+- create `README.md` with example title and setup instructions (copy from any near folder and replace needed fields)
+- Pull request!
+
+In most other cases, additional steps aren't required. Install, write, test, lint and your code is ready to be submitted!
+
+If everything from the list is done right, feel free to submit a PR! I will look into it asap.
+
+If some further assistance before making a PR is needed, ping [aldy505](https://t.me/aldy505) or [talentlessguy](talentless_guy) on telegram.