Add READMEs for spark and workiq plugins

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: JasonEtco

plugins/spark/README.md

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+# Spark
+
+Comprehensive guidance for building modern web applications with opinionated defaults for tech stack, design system, and code standards.
+
+## What it does
+
+Spark helps you quickly bootstrap high-quality web applications by providing:
+
+- Pre-vetted technology stack choices with multiple complexity-based variations
+- An opinionated design philosophy and system
+- Step-by-step setup workflows
+- Design and performance optimization guidance
+
+## Skills
+
+### `spark-app-template`
+
+Activated when a user wants to create a new web application, dashboard, or interactive interface. Provides guidance on:
+
+- **Tech stack** — Vite, React 19+, TypeScript, Tailwind CSS v4+, shadcn/ui, TanStack Router & Query
+- **Design system** — Typography pairings, OKLCH color palettes, spatial composition, micro-interactions
+- **Stack variations** — Pre-configured stacks tailored to app complexity (default web app, content showcase, data dashboard, complex application)
+- **Performance** — Core Web Vitals targets, React Compiler setup, optimization checklists
+- **Component patterns** — Common shadcn compositions and usage patterns
+
+## Stack variations
+
+| Stack | Use case |
+| --- | --- |
+| **Default Web App** | General-purpose tools, utilities, simple CRUD, MVPs, prototypes |
+| **Content Showcase** | Marketing sites, portfolios, blogs, documentation |
+| **Data Dashboard** | Analytics dashboards, admin panels, BI tools, monitoring |
+| **Complex Application** | SaaS platforms, enterprise tools, multi-view apps |

plugins/workiq/README.md

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+# WorkIQ
+
+Workplace intelligence plugin that connects AI agents to Microsoft 365 Copilot, providing access to organizational data from Outlook, Teams, SharePoint, OneDrive, and Calendar.
+
+## What it does
+
+WorkIQ grounds AI assistance in real workplace context by querying Microsoft 365 data sources. It enables agents to answer questions about:
+
+- **Emails & messages** — Find and summarize email threads and Teams conversations
+- **Meetings** — Retrieve decisions, action items, and context from calendar events
+- **Documents** — Locate specs, design docs, and files across SharePoint and OneDrive
+- **People** — Identify subject-matter experts, project owners, and organizational relationships
+- **Priorities** — Surface what colleagues are focused on, team goals, and project status
+
+## Skills
+
+### `workiq`
+
+Activated when a user asks about workplace context — what someone said, meeting outcomes, document locations, team priorities, or organizational knowledge. Uses the `ask_work_iq` MCP tool to query Microsoft 365 Copilot with natural language questions.
+
+## MCP server
+
+WorkIQ includes an MCP server configuration (`.mcp.json`) that runs the `@microsoft/workiq` package. Authentication is automatic using the connected user's existing Microsoft 365 credentials.
+
+## Requirements
+
+- Microsoft 365 account with Copilot access