docs: add README, CONTRIBUTING, and LICENCE

- Add project overview, installation, and usage guide
- Add contributing guidelines with setup and PR process
- Add MIT licence

CONTRIBUTING.md

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+# Contributing
+
+## Setup
+
+```bash
+git clone https://onixbyte.dev/onixbyte/claude-code-skill-manager.git
+cd claude-code-skill-manager
+cargo build
+```
+
+## Before submitting
+
+- Run `cargo fmt` to format your code
+- Run `cargo clippy` and fix any warnings
+- Ensure `cargo build` succeeds
+
+## Pull requests
+
+- Keep changes focused and atomic
+- Write clear commit messages following the [conventional commits](https://www.conventionalcommits.org/) format
+- Open PRs against the `main` branch
+
+## Issues
+
+Bug reports and feature requests are welcome. Please include steps to reproduce when reporting bugs.
+
+## Licence
+
+By contributing, you agree that your contributions will be licensed under the [MIT Licence](LICENCE).

LICENCE

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+MIT License
+
+Copyright (c) 2025 OnixByte
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Claude Code Skill Manager (CCSM)
+
+A CLI tool for discovering, installing, and managing [Claude Code](https://claude.ai/code) skills from Git-based marketplace repositories.
+
+## Installation
+
+### From source
+
+```bash
+git clone https://onixbyte.dev/onixbyte/claude-code-skill-manager.git
+cd claude-code-skill-manager
+cargo install --path .
+```
+
+### Pre-built binaries
+
+Download the latest binary for your platform from the [Releases](https://onixbyte.dev/onixbyte/claude-code-skill-manager/releases) page.
+
+## Quick start
+
+```bash
+# Register a skill marketplace
+ccsm marketplace add https://github.com/example/skills
+
+# Browse available skills
+ccsm search
+
+# Install a skill
+ccsm install my-skill
+
+# List installed skills
+ccsm list
+
+# See details about a skill
+ccsm info my-skill
+
+# Update installed skills
+ccsm update
+
+# Remove a skill
+ccsm remove my-skill
+```
+
+## Commands
+
+### Marketplace management
+
+| Command | Description |
+|---|---|
+| `ccsm marketplace add <url>` | Register a Git repository as a skill marketplace |
+| `ccsm marketplace remove <name>` | Unregister a marketplace |
+| `ccsm marketplace list` | List registered marketplaces |
+| `ccsm marketplace update [name]` | Refresh marketplace manifests |
+
+### Skill management
+
+| Command | Description |
+|---|---|
+| `ccsm search [query]` | Search available skills across all marketplaces |
+| `ccsm install <name>` | Install a skill (supports `--copy` and `--link` modes) |
+| `ccsm list` | Show installed skills |
+| `ccsm info <name>` | Show details about an installed skill |
+| `ccsm update [name]` | Update installed skills to latest |
+| `ccsm remove <name>` | Uninstall a skill |
+
+## How it works
+
+Skills are directories placed under `~/.claude/skills/` that Claude Code reads at startup. CCSM manages these directories by pulling skill definitions from marketplace repositories that expose a `skills.json` manifest:
+
+```json
+{
+  "name": "My Marketplace",
+  "skills": [
+    {
+      "name": "example-skill",
+      "description": "An example Claude Code skill",
+      "repository": "https://github.com/user/skill-repo",
+      "branch": "main"
+    }
+  ]
+}
+```
+
+## Deploy modes
+
+- **Copy** (default): Skill files are physically copied to `~/.claude/skills/<name>/`.
+- **Link**: A symlink is created from `~/.claude/skills/<name>/` to the local store, useful for development.
+
+## Building
+
+```bash
+cargo build --release
+```
+
+Cross-compilation targets: Linux (amd64), macOS (amd64), and Windows (amd64) via `cargo-zigbuild`.
+
+## Contributing
+
+See [CONTRIBUTING.md](CONTRIBUTING.md).
+
+## Licence
+
+[MIT](LICENCE)