chore: CONTRIBUITING file

CONTRIBUTING.md

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+# Contribuiting
+
+## Style Guide
+
+### Code
+
+We use the [Uber Go Style Guide](https://github.com/uber-go/guide/blob/master/style.md)
+as the base of how we write code. Some sections are ignored, such as:
+
+- [Use go.uber.org/atomic](https://github.com/uber-go/guide/blob/master/style.md)
+- [Prefix Unexported Globals with _](https://github.com/uber-go/guide/blob/master/style.md),
+  instead, avoid using globals in general if possible.
+
+## License Header
+
+All source code files inside the project should contain the Source Code Form
+License Notice of the [Mozzila Public License 2.0](https://mozilla.org/MPL/2.0/),
+[which this project uses](./LICENSE), at the first lines of the project.
+
+```
+Copyright (c) 2026 The Lored.dev Contributors. All Rights Reserved.
+Copyright (c) 2026 The DepGraph Contributors. All Rights Reserved.
+
+This Source Code Form is subject to the terms of the Mozilla Public
+License, v. 2.0. If a copy of the MPL was not distributed with this
+file, You can obtain one at https://mozilla.org/MPL/2.0/.
+
+SPDX-License-Identifier: MPL-2.0
+```
+