docs: Add CONTRIBUTING.md with commit message guidelines and structure

CONTRIBUTING.md

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+# Contributing
+
+## Commit Message Format
+
+```
+type(component): Description
+[Optional body]
+```
+
+## Types and Components
+
+### Change Types
+
+| Type     | Purpose                                            | Example                                            |
+| -------- | -------------------------------------------------- | -------------------------------------------------- |
+| `create` | Building entirely new components or systems        | `create(profile): 2160p Remux quality profile`     |
+| `add`    | Adding entries to existing systems                 | `add(format): de[42] as Tier 4 GPPi group`         |
+| `tweak`  | Fine-tuning and adjustments to existing components | `tweak(format): Better h265 parsing for 1080p WEB` |
+| `fix`    | Corrections and bug fixes                          | `fix(regex): Required negation for remux pattern`  |
+
+### Components
+
+| Component | Purpose                     | Includes                                                                                                 |
+| --------- | --------------------------- | -------------------------------------------------------------------------------------------------------- |
+| `format`  | Changes to Custom Formats   | - Format definitions<br>- Scoring adjustments<br>- Release group configurations<br>- Quality preferences |
+| `regex`   | Changes to regex patterns   | - Pattern definitions<br>- Matching logic<br>- Parser improvements<br>- Detection rules                  |
+| `profile` | Changes to Quality Profiles | - Profile creation/modification<br>- Quality settings<br>- Scoring systems<br>- Default configurations   |
+
+## Contributing with Profilarr
+
+Profilarr was built specifically to maintain these standards, making it our recommended way to contribute. While we welcome external contributions, please ensure they strictly follow these commit guidelines.