add toc

threejs/lessons/tr/toc.html

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+{{{tocHtml}}}
+<ul>
+  <li><a href="https://github.com/gfxfundamentals/threejsfundamentals">github</a></li>
+  <li><a href="https://threejs.org">three.js</a></li>
+  <li><a href="https://threejs.org/docs/">three.js dökümantasyonu</a></li>
+</ul>
+