feat: #2563 added RailRoad SRFB showcase (#2571)

* added RailRoad SRFB showcase
* Changed Image; size was imposed

showcase/index.html

@@ -315,6 +315,22 @@
                 </div>
             </div>
         </div>
+		
+		        <div class="col-md-12 col-lg-6">
+            <a href="https://gbrault.github.io/railroad-diagrams/live/live.html">
+                <img src="./images/expression-results.png" class="showcase img-responsive">
+            </a>
+            <div class="description">
+                <div class="descriptionHeader">
+                    <a href="https://github.com/gbrault/railroad-diagrams/blob/gh-pages/live/doc/readme.md"> RailRoad SRFB</a>
+                </div>
+                <div class="descriptionContent">
+                    RailRoad SRFB is a small hack dealing with Grammars and formal language representation.
+                    Vis is used there to show a tree representation of a valid expression i.e. conformant to the grammar rules.
+                </div>
+            </div>
+        </div>
+
     </div>
 
 </div>