added github action

Author: Ruminat

.env.example

@@ -0,0 +1,2 @@
+# Copy to .env for local development
+VITE_FORM_HANDLE=https://wedding.shrek-labs.ru/api/wedding/answer

.github/workflows/deploy.yml

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+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  pages: write
+  id-token: write
+
+concurrency:
+  group: pages
+  cancel-in-progress: true
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+
+      - run: npm install
+
+      - run: npm run build
+        env:
+          VITE_FORM_HANDLE: ${{ vars.VITE_FORM_HANDLE }}
+
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist
+
+      - id: deployment
+        uses: actions/deploy-pages@v4

README.md

@@ -1,3 +1,43 @@
+# Wedding invitation
+
 Свадьба, свадьба! Кольца, кольца!
 
-https://ruminat.github.io/wedding
+Live site: https://ruminat.github.io/wedding
+
+## Development
+
+```sh
+cp .env.example .env
+npm install
+npm run dev
+```
+
+## Environment variables
+
+| Variable | Where | Description |
+| --- | --- | --- |
+| `VITE_FORM_HANDLE` | `.env` locally, GitHub Actions variable in production | RSVP API URL |
+
+## Personalized invite links
+
+| Parameter | Description |
+| --- | --- |
+| `who` | Guest name (e.g. `Дорогая Олечка`) |
+| `plural` | Plural verb forms |
+| `fool` | Tweak button labels |
+| `scriptURL` | Override the RSVP API URL |
+
+Example:
+
+```
+https://ruminat.github.io/wedding/?who=Дорогие%20Катя%20и%20Денис&plural
+```
+
+## Deployment
+
+Every commit to `main` deploys to GitHub Pages.
+
+One-time setup:
+
+1. **Settings → Secrets and variables → Actions → Variables** — add `VITE_FORM_HANDLE`
+2. **Settings → Pages** — set source to **GitHub Actions**