Docs: Add Unity setup guide and templates (fixes #27)

.github/ISSUE_TEMPLATE/setup-unity.md

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+---
+name: Setup Unity for PixDash
+about: Steps to install Unity and verify project opens in Unity Hub
+---
+
+## Unity Setup
+
+Steps:
+
+1. Install Unity Hub from https://unity.com/download
+2. In Unity Hub → Installs → Add Editor → select **Unity 6.3 LTS (6000.3.2f1)**
+3. Clone the PixDash repository and open it from Unity Hub → Projects → Add
+
+After completing the steps, open a new issue or submit a PR with a screenshot showing PixDash in Unity Hub with the Unity version visible. See `CONTRIBUTING.md` for exact PR and `contributors/` filename requirements.

.github/PULL_REQUEST_TEMPLATE.md

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+# Pull Request Template
+
+Thank you for your contribution! For onboarding and setup PRs (Issue #27), please follow this template.
+
+## Description
+- Brief description of the change.
+
+## Checklist
+- [ ] I have claimed the corresponding issue before working on it.
+- [ ] This PR contains only the `contributors/<roll>.txt` file for onboarding (if applicable).
+- [ ] I have included a screenshot showing PixDash in Unity Hub with the Unity version visible.
+
+Attach screenshot (or include image link):
+
+--
+Preview image can be pasted below:
+
+![Unity Hub screenshot](link-or-attach-file)

CONTRIBUTING.md

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+# Contributing to PixDash
+
+Thanks for wanting to contribute! This document explains how to set up the project locally and how to submit the required verification for onboarding issues.
+
+## Required Unity Version
+- Unity Hub
+- Unity Editor: **6.3 LTS (6000.3.2f1)**
+
+Using a different Unity version may cause project errors. Install the correct version via Unity Hub before opening the project.
+
+## Quick Setup
+1. Fork this repository and clone your fork:
+
+   git clone https://github.com/<your-username>/PixDash.git
+
+2. Open Unity Hub → `Projects` → `Add` → select the cloned `PixDash` folder.
+3. Do not create a new project — open the repository as-is.
+
+## Onboarding Issue (Unity Setup)
+For the onboarding issue (see Issue #27), we require a screenshot proving you opened the project in Unity Hub with the correct Unity version visible.
+
+Steps to submit proof:
+1. In Unity Hub, open `Projects` and ensure `PixDash` appears with `Unity 6.3 LTS (6000.3.2f1)`.
+2. Take a screenshot that clearly shows the project name and Unity version.
+3. Add the screenshot link or short description to a text file in the `contributors/` folder named exactly with your roll number (for example `24CS0160.txt`). If you don't already have a file in `contributors/`, create one using your roll number as filename.
+4. Commit only your text file (do not commit Unity generated files) and open a Pull Request with the screenshot included in the PR description.
+
+Example content for `contributors/<your_roll_number>.txt`:
+
+```
+Name: Your Name
+Roll: 24CS0160
+Unity: Unity 6.3 LTS (6000.3.2f1)
+Proof: https://imgur.com/your-upload or GitHub PR screenshot
+```
+
+## PR Checklist
+- [ ] Claim the issue in the repository before starting work
+- [ ] Add only the intended `contributors/<roll>.txt` file for onboarding
+- [ ] Include the Unity Hub screenshot in the PR description
+- [ ] Keep changes focused to the issue scope
+
+If you need help, open a thread on the project's Discord or create an issue asking for guidance.
+
+Thank you — we look forward to your contributions!