Add author tag.

Author: kshetline

src/index.html

@@ -5,6 +5,7 @@
   <title>Pražský Orloj - Prague Astronomical Clock Simulator</title>
   <meta name="description" content="A simulation of the Prague Astronomical Clock (Pražský Orloj), configurable for any location on Earth, with user-settable time.">
   <meta name="keywords" content="astronomy, astronomical clocks, prague, pražský, clocks, medieval, horology, timekeeping">
+  <meta name="author" content="Kerry Shetline">
   <meta property="og:title" content="Pražský Orloj - Prague Astronomical Clock Simulator">
   <meta property="og:type" content="website">
   <meta property="og:url" content="https://shetline.com/orloj/">