fix: meta tags added (#859)

Co-authored-by: Tamal Das <tamalcodes@gmail.com>

index.html

@@ -9,6 +9,35 @@
   <meta name="description" content="Welcome to Milan, a hub for users to collaborate with NGOs, Charities and more."
     data-rh="true" />
   <meta name="google-site-verification" content="ISkkPcMaQwANRR5_0CPjjxQJ3SyWzUt94nSP7wc1JdA" />
+
+  <!-- Primary Meta Tags -->
+  <meta name="title" content="Milan" />
+  <meta name="language" content="en">
+  <meta name="author" content="Tamal Das">
+  <meta name="robots" content="index, follow">
+  <meta name="revisit-after" content="7 days">
+  <meta name="keywords" content="Milan, hub, connect, user collaboration, charities, NGO, support, social impact,community">
+
+    <!-- Open Graph / Facebook -->
+  <meta property="og:type" content="website" />
+  <meta property="og:url" content="https://milaan.vercel.app/" />
+  <meta property="og:title" content="Milan" />
+  <meta
+   property="og:description"
+   content="Welcome to Milan, a hub for users to collaborate with NGOs, Charities and more."
+  />
+  <meta property="og:image" content="https://user-images.githubusercontent.com/72851613/207783151-1d2f19cf-afa4-477b-8823-dcabb86adbf5.png" />
+
+  <!-- Twitter -->
+  <meta name="twitter:card" content="summary_large_image" />
+  <meta property="twitter:url" content="https://milaan.vercel.app/" />
+  <meta property="twitter:title" content="Milan" />
+  <meta
+   property="twitter:description"
+   content="Welcome to Milan, a hub for users to collaborate with NGOs, Charities and more."
+  />
+  <meta property="twitter:image" content="https://user-images.githubusercontent.com/72851613/207783151-1d2f19cf-afa4-477b-8823-dcabb86adbf5.png" />
+
   <link rel="apple-touch-icon" href="/logo192.png" />
 
   <link rel="manifest" href="/manifest.json" />