feat: add docs of java-dev-kit

Author: zihluwang

src/projects/java-dev-kit/api.md

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+# Changelog
+
+## v2.3.0 (12 Jun 2025)
+
+- feat: deprecate reflect map util by @siujamo in #67
+- feat: removed `property-guard-spring-boot-starter` by @zihluwang
+- feat: import key loading method by @siujamo in #68

src/projects/java-dev-kit/changelog.md

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+# Java Dev Kit <Badge type="info">2.3.0</Badge>
+
+Java Dev Kit is an open-source enterprise-grade Java development toolkit suite, designed to
+streamline and enhance your software development workflow. It provides a collection of modular tools
+and utilities tailored for various aspects of Java application development.
+
+## Features
+
+### 1. Version Management Module
+This module handles overall project management by utilising a BOM (Bill of Materials) to uniformly
+manage the versions of all imported dependencies, ensuring consistency and reducing version
+conflicts across your projects.
+
+### 2. Development Utility Tools
+A comprehensive set of practical utilities to simplify common development tasks, including but not
+limited to:
+
+- **AesUtil**: Provides AES encryption functionality.
+- **Base64Util**: Performs Base64 encoding and decoding for strings.
+- **BoolUtil**: Executes logical AND and OR operations on multiple boolean expressions.
+- **BranchUtil**: Reduces verbose `if-else` statements by combining `BoolUtil` with Lambda expressions for cleaner conditional flows.
+- **CollectionUtil**: Utilities designed for convenient and efficient collection handling.
+- **HashUtil**: Offers hashing operations on strings using various algorithms.
+- **MapUtil** and **ObjectMapAdapter**: Facilitate conversions between `Map` objects and specified Java classes.
+- **RangeUtil**: Generates ranged arrays based on specified bounds.
+
+### 3. Global Unique ID Generator
+A dedicated module providing a variety of generators for creating different types of globally unique
+identifiers (GUIDs), suitable for distributed systems and enterprise applications.
+
+### 4. Key Pair Loading Utilities
+Tools to load PEM-format key pair files (`PublicKey` and `PrivateKey`) into their corresponding Java
+objects. This utility can also be integrated within the main development utilities module for
+better cohesion.
+
+### 5. Mathematics and Statistics Utilities
+A set of tools for mathematical and statistical computations, currently supporting:
+
+- Chainable high-precision calculations.
+- Quartile computations.
+
+Consideration is given to merging this into the development utilities module for simplicity and
+easy access.
+
+### 6. JWT Tools
+Employing a facade pattern, Java Dev Kit allows the utilisation of various implementations for
+generating, parsing, and verifying JSON Web Tokens (JWT), making token management flexible
+and extensible.
+
+### 7. Serial Number Generator
+A utility to generate serial numbers following specified formats, useful for identifiers,
+order numbers, and other sequential data.
+
+## Getting Started
+
+To include Java Dev Kit in your project, please refer to the version management module’s BOM to
+ensure you use compatible and consistent dependency versions.
+
+## Contributing
+
+Java Dev Kit is open source and welcomes contributions. Please feel free to submit issues and pull
+requests to help improve the toolkit.
+
+## Licence
+
+This project is licensed under the Apache Licence. See the LICENSE file for details.
+
+---
+
+For more detailed documentation on each module and usage examples, please refer to the `/docs`
+directory or visit the project wiki.
+
+---
+
+Thank you for using Java Dev Kit, your trusted companion for enterprise Java development.