docs: add comprehensive CONTRIBUTING.md guide

[Devvekariya711]

• Add structured contribution guidelines with table of contents
• Include development setup for Android and Linux platforms
• Document code style guidelines and commit conventions
• Add PR submission process and checklists
• Include bug reporting and feature request guidelines
• Move translation guide to appendix for better organization
• Addresses the missing contribution documentation

Summary by CodeRabbit

• Documentation
  • Added a comprehensive contributing guide covering code of conduct, contribution types (bugs, features, code, docs, translations), and translation workflows
  • Included step-by-step development setup for Android and Linux, plus build and test instructions
  • Documented branching, commit message conventions, PR submission process, coding style guidelines, and links to additional resources and licensing information

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a new CONTRIBUTING.md outlining contributor policies and workflows, development setup and build/test steps for Android and Linux, branching and commit conventions, PR process, code style guidelines (Kotlin/C++), translation workflows, and related reference links (341 lines added).

Changes

Cohort / File(s)	Summary
Contributor Guidelines Documentation CONTRIBUTING.md	New comprehensive contributing guide (+341 lines) covering code of conduct, contribution types (bugs, features, code, docs, translations), development setup and build/test steps for Android and Linux, branching and commit conventions, PR submission process, Kotlin/C++ style guidelines, translation workflow, and reference links.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add comprehensive CONTRIBUTING.md guide' directly and clearly summarizes the main change—adding a new comprehensive contribution guide file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@CONTRIBUTING.md`:
- Around line 268-269: Update the misspelled link text "AAP Protocol
(Third-party)" target URL label from "AAP-Protocol-Defintion" to the correct
spelling "AAP-Protocol-Definition" and verify the linked URL is valid; modify
the markdown line containing the link text/URL so the display text and the
GitHub repository path use "Definition" instead of "Defintion" to prevent a 404.
- Around line 69-84: Update the Android toolchain notes: replace "Android Studio
Ladybug (2024.2.1+)" with "Android Studio Narwhal (2025.1.x)" and change the
minimum Android SDK requirement from "API 33 (min)" to "API 35 (min)" while
keeping target API (API 36) if desired; also add a brief Qt recommendation under
"Linux Development" specifying a tested Qt 6 version (e.g., "Qt 6.10.1") so
readers know which Qt 6 release to use, leaving CMake 3.22+ and OpenSSL/libpulse
headers unchanged.

🧹 Nitpick comments (3)

CONTRIBUTING.md (3)

215-223: Add language to fenced code block (MD040).

Markdownlint flags this block; add a language (e.g., text) to avoid lint failures.

✏️ Proposed fix

-```
+```text
 <type>(<scope>): <description>

 [optional body]

 [optional footer]

</details>

---

`235-239`: **Add language to fenced code block (MD040).**

Same lint issue as above for the examples block.  


<details>
<summary>✏️ Proposed fix</summary>

```diff
-```
+```text
 feat(android): add German translation
 fix(linux): resolve system tray detection
 docs: update development setup guide

</details>

---

`198-199`: **Timestamp the hiatus note to reduce staleness.**

This is time-sensitive. Consider adding “as of January 2026” so readers know when it was accurate.  


<details>
<summary>✏️ Proposed tweak</summary>

```diff
-3. **Wait for review** (Note: Maintainer on hiatus until May 2026)
+3. **Wait for review** (Note: Maintainer on hiatus until May 2026, as of January 2026)

[coderabbitai]

Actionable comments posted: 2

🤖 Fix all issues with AI agents

In `@CONTRIBUTING.md`:
- Around line 217-223: Update the fenced code block that shows the commit
message template by adding the language identifier "text" after the opening
backticks so markdownlint MD040 is satisfied; specifically modify the block that
starts with ``` and contains "<type>(<scope>): <description>" to begin with
```text and keep the inner commit template content unchanged.
- Around line 235-239: The fenced code block showing commit examples is missing
a language tag (triggers markdownlint MD040); update the triple-backtick block
that contains the three commit lines (`feat(android): add German translation`,
`fix(linux): resolve system tray detection`, `docs: update development setup
guide`) to include the `text` language specifier (i.e., change ``` to ```text)
so the block is fenced with a language.

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Add language to fenced code block for commit format.

markdownlint (MD040) flags missing language. Use text to keep formatting consistent.

✅ Proposed fix

-```
+```text
<type>(<scope>): <description>

[optional body]

[optional footer]

🧰 Tools

🪛 markdownlint-cli2 (0.18.1)

217-217: Fenced code blocks should have a language specified

(MD040, fenced-code-language)

🤖 Prompt for AI Agents

In `@CONTRIBUTING.md` around lines 217 - 223, Update the fenced code block that
shows the commit message template by adding the language identifier "text" after
the opening backticks so markdownlint MD040 is satisfied; specifically modify
the block that starts with ``` and contains "<type>(<scope>): <description>" to
begin with ```text and keep the inner commit template content unchanged.