Added DevC Yaounde Leads

Hi, This PR adds DevC Yaounde Leads in the file DevCGlobalDirectory.md

Author: FotieMConstant

DevCGlobalDirectory.md

@@ -372,6 +372,18 @@
   - Github: https://github.com/Devc-Douala
 </details>
 
+<details>
+  <summary>
+    <b>DevC Yaounde</b>
+  </summary>
+
+  - Lead(s):
+    - [Aurelien Xavier](https://github.com/xavier-pay)
+    - [Suzy Tresor Tchegnelene](#)
+  - Facebook Group: https://www.facebook.com/groups/1216588391854380/
+  - Github: #
+</details>
+
 <details>
   <summary>
     <b>DevC Owerri</b>