add VHS-generated GIFs for all examples

Created tape files and GIFs demonstrating each example:
- counter, timer, list, spinner, views, http
- Updated README with GIF showcase

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

assets/list.tape

@@ -0,0 +1,56 @@
+# List Selection Example
+Output assets/list.gif
+
+Set Shell "bash"
+Set FontSize 16
+Set Width 700
+Set Height 500
+Set Theme "Catppuccin Mocha"
+
+Type "bb list"
+Enter
+Sleep 1s
+
+# Navigate down and select
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 400ms
+
+# Navigate up
+Type "k"
+Sleep 300ms
+Type "k"
+Sleep 300ms
+
+# Deselect
+Type " "
+Sleep 400ms
+
+# Navigate and select more
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type "j"
+Sleep 300ms
+Type " "
+Sleep 600ms
+
+# Submit
+Enter
+Sleep 1s