Create CONTRIBUTING.md

Author: makbn

CONTRIBUTING.md

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+# Contributing to This Project
+
+First off — thanks for checking out this project.
+
+While this is a small and focused library, and I'm not actively contributing, you're still welcome to open issues, suggest improvements, or fork it for your own use.
+
+## Guidelines
+
+If you do want to contribute, here are a few quick guidelines to follow to keep things clean and consistent:
+
+### 1. Keep It Aligned with the Project Scope
+
+This library is meant to stay minimal, maintainable, and aligned with its current goals. If you're adding something, ask:
+- Does this keep the project simple?
+- Does it make it easier to integrate JL Map - Java Leaflet into existing projects?
+- Is it a core use case?
+
+If you're not sure, open an issue first before writing code — happy to talk about it.
+
+### 2. Code Style
+
+Stick to standard Java conventions. If you're using an IDE like IntelliJ, the default formatter should be fine. We also added spotless since v2.2.1. Some specific preferences:
+
+- Keep every block of the code as small as possible, break it down if possible
+- Avoid unnecessary abstractions.
+- Avoid unnecessary documentation.
+- Keep the code, variable/class/method/etc naming self explanatory
+- Don’t go overboard creating tons of classes and interfaces just to perfectly follow a specific design or pattern—they're guidelines, not laws of nature.
+- Prefer immutability where possible.
+- Javadoc ,at least, public APIs.
+
+### 3. Commit Messages
+
+- Keep commit messages short and meaningful. 
+- Avoid using any special characters. 
+- Focus on delivering enough context than being grammatically correct. 
+
+Thank you.