Add SchildiChat to clients (#301)

* Add SchildiChat to clients

mostly adapted version of element.js,
as SchildiChat is an fork of Element.

* SchildiChat: Change description to new official one

Reason: https://github.com/matrix-org/matrix.to/pull/301#issuecomment-1465739125
Source: https://raw.githubusercontent.com/SchildiChat/SchildiChat-android/5bbd462cdbecf64ceda7e65e8cd8a4e241bfca03/fastlane/metadata/android/en-US/short_description.txt

* SchildiChat: Add test instance to trusted web instances

Reason: https://github.com/matrix-org/matrix.to/pull/301#issuecomment-1465739125

src/open/clients/index.js

@@ -15,6 +15,7 @@ limitations under the License.
 */
 
 import {Element} from "./Element.js";
+import {SchildiChat} from "./SchildiChat.js";
 import {Weechat} from "./Weechat.js";
 import {Nheko} from "./Nheko.js";
 import {Fractal} from "./Fractal.js";
@@ -29,6 +30,7 @@ import {Cinny} from "./Cinny.js"
 export function createClients() {
     return [
         new Element(),
+        new SchildiChat(),
         new Weechat(),
         new Nheko(),
         new Fractal(),