doc: Add a showcase for QUIC link sharing

Based on the QUIC shared_link example.

Author: torokati44

.oppfeatures

@@ -1381,6 +1381,21 @@
         compileFlags = ""
         linkerFlags = ""
         />
+    <feature
+        id = "QuicShowcases"
+        name = "QUIC showcases"
+        description = "Showcases for the QUIC protocol."
+        initiallyEnabled = "true"
+        requires = "Ethernet Ieee8021d Ipv4 Loopback Quic Queueing TcpInet Udp"
+        recommended = ""
+        labels = ""
+        nedPackages = "
+                       inet.showcases.quic
+                      "
+        extraSourceFolders = ""
+        compileFlags = ""
+        linkerFlags = ""
+        />
     <feature
         id = "Rip"
         name = "RIP routing"

showcases/index.rst

@@ -18,6 +18,7 @@ the simulations (NED, ini, and other files) and the web pages are in the
 
 Latest changes:
 
+- :doc:`quic/linksharing/doc/index` added (2024-02-26)
 - :doc:`emulation/mininet/doc/index` added (2024-02-26)
 - :doc:`tsn/trafficshaping/underthehood/doc/index` updated (2023-07-28)
 - :doc:`tsn/trafficshaping/cbsandtas/doc/index` released (2023-07-28)
@@ -40,6 +41,7 @@ All showcases:
    general/index
    measurement/index
    mobility/index
+   quic/index
    routing/index
    visualizer/canvas/index
    visualizer/osg/index

showcases/quic/index.rst

@@ -0,0 +1,9 @@
+QUIC
+====
+
+These showcases demonstrate the QUIC implementation in INET.
+
+.. toctree::
+   :maxdepth: 1
+
+   linksharing/doc/index