Add Jellybean (#117)

README.md

@@ -74,6 +74,7 @@
   - [Project Management](#project-management)
   - [Timers / Time Tracking](#timers--time-tracking)
   - [To-do Lists](#to-do-lists)
+  - [Inventory](#inventory)
 - [Security and Privacy](#security-and-privacy)
   - [Password Management](#password-management)
 - [Finance](#finance)
@@ -554,6 +555,10 @@ Clients for commercial social platforms that had their API access cut off in a w
 
 [todo.txt]: https://github.com/todotxt/todo.txt
 
+### Inventory
+
+- [Jellybean](https://codeberg.org/turtle/jellybean) - Inventory manager with refill functions and a handy low-stock indicator `#vala` `#libadwaita`.
+
 ## Security and Privacy
 
 - [Collision](https://collision.geopjr.dev) - Tool to generate, compare and verify hashes `#crystal` `#libadwaita`.