add twitter tags

index.html

@@ -8,6 +8,12 @@
     <meta property='og:image' content='https://fcl.dev/social.png'>
     <meta property='og:type' content='website'>
     <meta property='og:url' content='https://fcl.dev'>
+    <meta property='twitter:domain' content='fcl.dev'>
+    <meta property='twitter:url' content='https://fcl.dev'>
+    <meta name='twitter:title' content='FCL - Fair Core License'>
+    <meta name='twitter:description' content='The Fair Core License, or FCL, is a mostly-permissive non-compete Fair Source license that eventually transitions to Open Source after 2 years.'>
+    <meta name='twitter:image' content='https://fcl.dev/social.png'>
+    <meta name='twitter:card' content='summary_large_image'>
     <link rel='icon' href='logos/fcl.svg'>
     <link rel='preload' href='https://assets.keygen.sh/fonts/owners/woff2/OwnersXXWide-Medium.woff2' as='font' type='font/woff2' crossorigin>
     <link rel='preload' href='https://assets.keygen.sh/fonts/owners/woff2/OwnersXXWide-MediumItalic.woff2' as='font' type='font/woff2' crossorigin>