Add eBay's NuRaft C++ implementation

NuRaft is a C++ implementation derived from Cornerstone (also listed
in this page) project. It's used for various products in eBay.

Author: greensky00

index.html

@@ -1862,6 +1862,16 @@ <h3>Where can I get Raft?</h3>
   <td>Yes</td>
   <td>2019-08-19</td>
 </tr>
+<tr>
+  <td><a href="https://github.com/ebay/nuraft">NuRaft</a></td>
+  <td><a href="https://github.com/greensky00">Jung-Sang Ahn</a> (eBay)</td>
+  <td>C++</td>
+  <td>Apache2.0</td>
+  <td>Yes</td>
+  <td>Yes</td>
+  <td>Yes</td>
+  <td>2019-09-11</td>
+</tr>
 </tbody>
 </table>