Add Syncthing (#327)

* Add Syncthing

* fix sonarr reference

* update Chart.lock

* add URL

* update github username (?)

* edit test_values  volumes

* fix chart home

Co-authored-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

* remove chart upstream version

Co-authored-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

* update sources

Co-authored-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

* update maintainers

Co-authored-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

* add myself as syncthing maintainer

* use single volume for storage

* fix newline

Co-authored-by: Kjeld Schouten-Lebbing <kjeld@schouten-lebbing.nl>

.github/CODEOWNERS

@@ -24,3 +24,6 @@ collabora-online/	@stavros-k
 
 # Apps maintained by djs52
 emby/ @djs52
+
+# Apps maintained by luuknieuwdorp
+syncthing/ @luuknieuwdorp