Added sample Linux package and updated index.html with link to it

Author: jody

docs/index.html

@@ -7,6 +7,10 @@ <h2>Repository</h2>
   <a href="https://github.com/MetroCS/NativeJavaApp">MetroCS/NativeJavaApp</a>
   <h2>Examples</h2>
   <h3>LINUX</h3>
+  <ul>
+    <li>Installer built using the default application:
+      <a href="sampleapp_1.0.0_arm64.deb">sampleapp_1.0.0 package</a></li>
+  </ul>
   <h3>MacOS</h3>
   <ul>
     <li>Installer built using the default application: