Add Kdenlive (#1914)

Added Kdenlive and organized list by alphabetical order.

Signed-off-by: frdbr <[email protected]>

Author: frdbr

ADOPTERS.md

@@ -7,8 +7,9 @@ Below is a partial list of organizations and projects that are using OpenTimelin
 | [Adobe Premiere Pro](https://www.adobe.com/products/premiere.html) | [Timeline import/export](https://community.adobe.com/t5/premiere-pro-beta-discussions/new-in-beta-otio-import-and-export/td-p/14937493) (beta) |
 | [AVID Media Composer](https://www.avid.com/media-composer) | Timeline export (preview) |
 | [Black Magic Design DaVinci Resolve](https://www.blackmagicdesign.com/products/davinciresolve/) | Timeline import/export |
-| [CineSync](https://www.backlight.co/product/cinesync) | Timeline viewing |                                                                                                                                                    |
-| [ColorFront Transkoder](https://colorfront.com/index.php?page=SOFTWARE&spage=Transkoder) | Timeline import                                                                                                                                |
-| [Nuke Studio](https://www.foundry.com/products/nuke) | Timeline import/export with full timeline round-tripping                                                                                       |
-| [Hiero](https://www.foundry.com/products/nuke-family/hiero) | Timeline import/export                                                                                       |
-| [OpenRV](https://github.com/AcademySoftwareFoundation/OpenRV) | Timeline import and viewing                                                                                                                    |
+| [CineSync](https://www.backlight.co/product/cinesync) | Timeline viewing |                                                                            
+| [ColorFront Transkoder](https://colorfront.com/index.php?page=SOFTWARE&spage=Transkoder) | Timeline import |
+| [Hiero](https://www.foundry.com/products/nuke-family/hiero) | Timeline import/export |
+| [Kdenlive](https://kdenlive.org) | Timeline import/export |
+| [Nuke Studio](https://www.foundry.com/products/nuke) | Timeline import/export with full timeline round-tripping |
+| [OpenRV](https://github.com/AcademySoftwareFoundation/OpenRV) | Timeline import and viewing |