feat: added tui

docs/tui.md

@@ -0,0 +1,28 @@
+# TUI
+
+The end-user ui for the vibebox
+
+## TUI header
+
+- This is a welcome header.
+- Shows text: "Welcome to Vibebox vX.X.XX"
+- Shows the ASCII banner
+- An outlined box
+    - Shows the current directory
+    - Shows current vm version and max memory, cpu cores
+- The position is flex, so this will move with the VM terminal history.
+
+## Terminal Area
+
+- Shows all the VM terminal history
+
+## Vibebox input area
+
+- A text input area, user can input text in it, it can vertically expand depending on the text length, by default it
+  is a line high.
+- it should be able to switch to auto-completion mode, which will display a list of available commands. When in this mode, the bottom
+  status bar will disappear. The auto completions are displayed right below the text input area.
+
+## Bottom status bar
+
+- Display texts in gray, a line high. on the left it shows `:help` for help.