add https://github.com/avih/tldr-fmt (shell formatter)

Author: avih

index.html

@@ -110,6 +110,10 @@ <h2 id="installation">
             <td><a href="https://github.com/isacikgoz/tldr">Go client</a></td>
             <td><code>go get -u github.com/isacikgoz/tldr</code></td>
           </tr>
+          <tr>
+            <td><a href="https://github.com/avih/tldr-fmt">Terminal-format-only POSIX shell script</a></td>
+            <td><code>git clone https://github.com/avih/tldr-fmt</code></td>
+          </tr>
         </tbody>
       </table>
       <p>