docs: add contribution file

CONTRIBUTING.md

@@ -0,0 +1,55 @@
+# Contributing
+
+We welcome contribution from everyone.
+
+## Issues
+
+You can contribute to this repository
+
+- Improving our [docs](https://mugglim.github.io/build-your-own-tanstack-query/).
+- Improving our [tanstack-query-lite](https://github.com/mugglim/build-your-own-tanstack-query/tree/chore/add-contributing/tanstack-query-lite) features.
+
+## Get started
+
+### Installation
+
+Please follow these steps to get started:
+
+- Fork and clone this repository
+
+  ```
+  cd build-your-own-tanstack-query
+  ```
+
+- Install package
+  ```
+  npm install
+  ```
+
+### Run docs dev server
+
+```
+npm run docs:dev
+```
+
+### Run dev server
+
+```
+npm run dev
+```
+
+## Pull Requests
+
+We merge pull requests by squashing all commits.  
+Please ensure your PR template titles match the example below.
+
+```
+<type>: <description>
+```
+
+`type` must be one of the following:
+
+- `feat`: A new tanstack-query-lite feature.
+- `docs`: Documentation only changes.
+- `fix`: A bug fix
+- `chore`: Anything else

README.md

@@ -1,29 +1,18 @@
-<div align="center">
-  <h1> Build Your Own TanStack Query and useQuery</h1>
-</div>
+# Build Your Own TanStack Query
 
-<p align="center">
-  <a href="https://mugglim.github.io/build-your-own-tanstack-query">한국어</a> | <a href="/en.md">English</a>
-</p>
+<a href="https://mugglim.github.io/build-your-own-tanstack-query">한국어</a> | <a href="/en.md">English</a>
 
 ## Introduction
 
-We're going to rewrite TanStack Query and useQuery from scratch. We'll be using the ideas and code from [Let's Build React Query in 150 Lines of Code!](https://www.youtube.com/watch?v=9SrIirrnwk0) and TanStack Query v5.
+We're going to rewrite TanStack Query and useQuery from scratch.
+We'll be using the ideas and code from [Let's Build React Query in 150 Lines of Code!](https://www.youtube.com/watch?v=9SrIirrnwk0) and TanStack Query v5.
 
-## Play Locally
-
-Install package
-
-```
-npm install
-```
+## Demo
 
-Run development server
+https://github.com/user-attachments/assets/11454b80-034a-4205-b051-5a3c78f1b9d0
 
-```
-npm run dev
-```
+## Contributing
 
-## Demo
+We welcome contribution from everyone. Read below for contributing guidelines.
 
-https://github.com/user-attachments/assets/11454b80-034a-4205-b051-5a3c78f1b9d0
+[CONTRIBUTING](/CONTRIBUTING.md)

en.md

@@ -1,14 +1,11 @@
-<div align="center">
-  <h1> Build Your Own TanStack Query and useQuery</h1>
-</div>
+# Build Your Own TanStack Query and useQuery
 
-<p align="center">
-  <a href="./docs/ko.md">한국어</a> | <a href="/README.md">English</a>
-</p>
+<a href="./docs/ko.md">한국어</a> | <a href="/README.md">English</a>
 
 ## Introduction
 
-We're going to rewrite TanStack Query and useQuery from scratch. We'll be using the ideas and code from [Let's Build React Query in 150 Lines of Code!](https://www.youtube.com/watch?v=9SrIirrnwk0) and TanStack Query v5.
+We're going to rewrite TanStack Query and useQuery from scratch.  
+We'll be using the ideas and code from [Let's Build React Query in 150 Lines of Code!](https://www.youtube.com/watch?v=9SrIirrnwk0) and TanStack Query v5.
 
 > [!WARNING]
 >
@@ -21,23 +18,24 @@ We're going to rewrite TanStack Query and useQuery from scratch. We'll be using
 
 ## TOC
 
-- [Introduction](#introduction)
-- [TOC](#toc)
-- [Play Locally](#play-locally)
-- [Architecture](#architecture)
-- [Step 1: Core Implementation](#step-1-core-implementation)
-  - [QueryClient](#queryclient)
-  - [QueryCache](#querycache)
-  - [Query](#query)
-  - [QueryObserver](#queryobserver)
-- [Step 2: Integration with React](#step-2-integration-with-react)
-  - [Trigger re-render when the state of Query changes](#trigger-re-render-when-the-state-of-query-changes)
-  - [QueryClientProvider](#queryclientprovider)
-  - [useQuery](#usequery)
-- [Step 3: Additional Features](#step-3-additional-features)
-  - [1. Trigger refetch when the browser’s focus state changes](#1-trigger-refetch-when-the-browsers-focus-state-changes)
-  - [2. Creating a developer tool like ReactQueryDevtools](#2-creating-a-developer-tool-like-reactquerydevtools)
-- [Reference](#reference)
+- [Build Your Own TanStack Query and useQuery](#build-your-own-tanstack-query-and-usequery)
+  - [Introduction](#introduction)
+  - [TOC](#toc)
+  - [Play Locally](#play-locally)
+  - [Architecture](#architecture)
+  - [Step 1: Core Implementation](#step-1-core-implementation)
+    - [QueryClient](#queryclient)
+    - [QueryCache](#querycache)
+    - [Query](#query)
+    - [QueryObserver](#queryobserver)
+  - [Step 2: Integration with React](#step-2-integration-with-react)
+    - [Trigger re-render when the state of Query changes](#trigger-re-render-when-the-state-of-query-changes)
+    - [QueryClientProvider](#queryclientprovider)
+    - [useQuery](#usequery)
+  - [Step 3: Additional Features](#step-3-additional-features)
+    - [1. Trigger refetch when the browser’s focus state changes](#1-trigger-refetch-when-the-browsers-focus-state-changes)
+    - [2. Creating a developer tool like ReactQueryDevtools](#2-creating-a-developer-tool-like-reactquerydevtools)
+  - [Reference](#reference)
 
 ## Play Locally