docs: add Cursor install guide and VS Code note

.cursor-plugin/INSTALL.md

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+# Installing MiniMax Skills for Cursor
+
+Enable MiniMax skills in Cursor by cloning the repository locally and pointing Cursor's skills path at the `skills/` directory.
+
+## Prerequisites
+
+- Cursor installed
+- Git
+
+## Installation
+
+### macOS / Linux
+
+```bash
+git clone https://github.com/MiniMax-AI/skills.git ~/.cursor/minimax-skills
+```
+
+Set Cursor's skills path to:
+
+```text
+~/.cursor/minimax-skills/skills/
+```
+
+### Windows (PowerShell)
+
+```powershell
+git clone https://github.com/MiniMax-AI/skills.git "$env:USERPROFILE\.cursor\minimax-skills"
+```
+
+Set Cursor's skills path to:
+
+```text
+%USERPROFILE%\.cursor\minimax-skills\skills\
+```
+
+After saving the path, restart Cursor or reload the window so it rescans local skills.
+
+## Verify
+
+Confirm the clone exists and contains `SKILL.md` files:
+
+### macOS / Linux
+
+```bash
+find ~/.cursor/minimax-skills/skills -maxdepth 2 -name SKILL.md | head
+```
+
+### Windows (PowerShell)
+
+```powershell
+Get-ChildItem "$env:USERPROFILE\.cursor\minimax-skills\skills" -Directory | ForEach-Object {
+    Get-ChildItem $_.FullName -Filter SKILL.md
+}
+```
+
+## Updating
+
+### macOS / Linux
+
+```bash
+cd ~/.cursor/minimax-skills && git pull
+```
+
+### Windows (PowerShell)
+
+```powershell
+Set-Location "$env:USERPROFILE\.cursor\minimax-skills"
+git pull
+```
+
+## Uninstalling
+
+### macOS / Linux
+
+```bash
+rm -rf ~/.cursor/minimax-skills
+```
+
+### Windows (PowerShell)
+
+```powershell
+Remove-Item -Recurse -Force "$env:USERPROFILE\.cursor\minimax-skills"
+```
+
+## VS Code Note
+
+This repository does not currently ship a standalone VS Code extension.
+
+If you use VS Code, the recommended options are:
+- run a supported CLI tool such as Codex, Claude Code, or OpenCode inside the VS Code integrated terminal
+- use Cursor if you want native local-skills configuration from this repository