chore: add basic instructions for copilot coding agent

Author: JohannesRudolph

.github/copilot-instructions.md

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+# Copilot Instructions for meshStack Documentation
+
+This is a Docusaurus v3 project. Follow these guidelines when making changes.s
+
+## Before Making Changes
+
+**Read relevant instruction files** based on your task:
+
+Always obey the following:
+- [tone instructions](instructions/tone.instructions.md)
+- [capitalization and wording instructions](instructions/capitalizationandwording.instructions.md)
+
+The following applies to specific file types:
+- Instructions for [writing guides](instructions/guide.instructions.md) 
+
+## Before Committing
+
+Always run these commands to validate your changes:
+
+```bash
+yarn lint    # Check for documentation errors
+yarn build   # Ensure the site builds correctly
+```
+
+Do not commit if either command fails.
+
+## Key Commands
+
+- `yarn start` - Development server
+- `yarn build` - Production build
+- `yarn lint` - Run all linters
+- `yarn typecheck` - TypeScript validation
+
+## Project Structure
+
+- `docs/` - Documentation files
+- `blog/` - Blog posts
+- `static/` - Static assets
+- `src/` - Source code
+- `docusaurus.config.ts` - Main configuration

.github/workflows/copilot-setup-steps.yml

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+name: "Copilot Setup Steps"
+
+# Automatically run the setup steps when they are changed to allow for easy validation, and
+# allow manual testing through the repository's "Actions" tab
+on:
+  workflow_dispatch:
+  push:
+    paths:
+      - .github/workflows/copilot-setup-steps.yml
+  
+jobs:
+  # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
+  copilot-setup-steps:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    # You can define any steps you want, and they will run before the agent starts.
+    # If you do not check out your code, Copilot will do this for you.
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "18.x"
+          cache: "yarn"
+          cache-dependency-path: "**/yarn.lock"
+
+      - name: Install dependencies
+        run: yarn install --frozen-lockfile
+
+