feat: Add README files for various modules and routes

src/lib/ae_posts/README.md

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+# Aether (AE) Posts Module
+
+The Posts module provides functionality for creating and managing posts and their associated comments. This is suitable for features like a blog, forum, or bulletin board.
+
+## Data Structures
+
+### Post
+
+A `Post` object represents a single entry, such as a blog post or a forum thread. It contains a title, content, and metadata about the author and topic.
+
+### Post Comment
+
+A `Post_Comment` object represents a comment made on a `Post`.
+
+## Functionality
+
+This module provides the following functionality:
+
+-   **CRUD Operations:** Create, Read, Update, and Delete operations for both `Post` and `Post_Comment` objects.
+-   **Local Caching:** Uses Dexie.js to cache data in the browser's IndexedDB for offline access and faster load times.
+-   **API Interaction:** All data operations are synced with the backend API.
+
+## Files
+
+-   `ae_posts__post.ts`: Contains functions for managing `Post` objects.
+-   `ae_posts__post_comment.ts`: Contains functions for managing `Post_Comment` objects.
+-   `ae_posts_functions.ts`: Exports all the functions from the module for easy use in other parts of the application.
+-   `db_posts.ts`: Defines the IndexedDB schema for the posts module using Dexie.js.