feat: reorganize apps directory and add README

This commit reorganizes the `apps` directory for better clarity and adds a README file to document the available apps.

The changes include:
- Renaming `apps/interactive.chat.sh` to `apps/chat.sh`.
- Renaming `apps/interactive.generate.sh` to `apps/generate.sh`.
- Creating a new `apps/README.md` file with a table of contents that links to the apps and provides a brief description for each.

These changes make the `apps` directory more organized and user-friendly.

Author: google-labs-jules[bot]

apps/README.md

@@ -0,0 +1,8 @@
+# Apps
+
+This directory contains interactive apps that use the Ollama Bash Lib.
+
+| App | Description |
+|---|---|
+| [`chat.sh`](chat.sh) | An interactive chat session with message history. |
+| [`generate.sh`](generate.sh) | An interactive prompt for generating text, without message history. |