Add README

Maintenance note: index.html is generated from the shared design + live data — do not hand-edit.

Author: vladimir-litvinchik

README.md

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+# GroupDocs.Conversion — landing page
+
+GitHub Pages site for **GroupDocs.Conversion**, served at <https://groupdocs-conversion.github.io/>.
+
+## Maintenance
+- **`index.html` is generated — do not edit it by hand.** It is produced by the
+  GroupDocs landing-page generator from a shared design plus live product data
+  (versions, GitHub stars, and download counts from
+  <https://products.groupdocs.com/versions.json> — baked in at build time and
+  refreshed in the browser on load).
+- `groupdocs.svg` and `favicon.ico` are assets used by the page.
+
+To change the page, update the generator inputs and re-run it — don't hand-edit `index.html`.
+
+Example code referenced from this page is MIT licensed.