Add "Platform-Support"

Platform-Support.-.md

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+# Platform Support
+
+MokoJoomOpenGraph outputs platform-specific meta tags optimized for each social network.
+
+## Meta Tags by Platform
+
+### Facebook / Meta
+- `og:title`, `og:description`, `og:image`, `og:url`, `og:type`, `og:site_name`, `og:locale`
+- `og:image:width` (1200), `og:image:height` (630)
+- `fb:app_id` (optional)
+
+### Twitter / X
+- `twitter:card` (summary or summary_large_image)
+- `twitter:title`, `twitter:description`, `twitter:image`
+- `twitter:site` (@username)
+
+### LinkedIn
+- Reads standard `og:*` tags
+- `article:published_time`, `article:modified_time`, `article:author` (on article pages)
+
+### Discord
+- Reads standard `og:*` tags
+- `theme-color` meta tag controls the embed sidebar color
+
+### Telegram
+- Reads standard `og:*` tags
+- `telegram:channel` for channel link previews
+
+### WhatsApp
+- Reads standard `og:*` tags
+- Images auto-resized to meet minimum 300x200px requirement
+
+## JSON-LD Structured Data
+
+On article pages:
+- `Article` schema with headline, description, image, author, datePublished, dateModified
+
+On all pages:
+- `WebPage` schema with name, description, URL
+- `BreadcrumbList` schema from Joomla pathway (optional)