Add webthing-cpp to third party libraries

Author: bw-hro

framework/index.html

@@ -996,6 +996,12 @@ <h2>Third Party Libraries</h2>
                 Python<br /><span class="author">by hidaris</span>
               </a>
             </div>
+            <div class="library">
+              <a href="https://github.com/bw-hro/webthing-cpp">
+                <img alt="GitHub logo" src="images/github.png" />
+                C++<br /><span class="author">by Benno Waldhauer</span>
+              </a>
+            </div>
           </section>
         </div>
       </section>