Update Showcase.md (#3842)

Add new projects to the showcase file

Author: MaciekWin3

Showcase.md

@@ -21,6 +21,18 @@
 * **[Capital and Cargo](https://github.com/dhorions/Capital-and-Cargo)** - A retro console game where you buy, sell, produce and transport goods built with Terminal.Gui
  ![image](https://github.com/gui-cs/Terminal.Gui/assets/1682004/ed89f3d6-020f-4a8a-ae18-e057514f4c43)
 
+- **[Falcon](https://github.com/MaciekWin3/Falcon)** - Terminal chat application that uses SignalR and Terminal.Gui.
+  ![Falcon](https://github.com/user-attachments/assets/d505cba3-75d3-43ea-b270-924dfd257a65)
+
+- **[Muse](https://github.com/MaciekWin3/Muse)** - Muse is terminal music player built with Terminal.Gui and NAudio on .NET platform.
+  ![Muse](https://github.com/user-attachments/assets/94aeb559-a889-4b52-bb0d-453b3e19b290)
+z
+- **[Whale](https://github.com/MaciekWin3/Whale)** - Lightweight terminal user interface application that helps software engineers manage Docker containers.
+  ![Whale](https://github.com/user-attachments/assets/7ef6e348-c36b-4aee-a63c-4e5c60c3aad2)
+
+- **[TermKeyVault](https://github.com/MaciekWin3/TermKeyVault)** - Terminal based password manager built with F# and Terminal.Gui.
+  ![TermKeyVault](https://github.com/user-attachments/assets/c40e17ed-2614-4ad4-8547-e93c1b1d8937)
+
 
 # Examples #