feat: Add README files for various modules and routes

src/lib/ae_sponsorships/README.md

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+# Aether (AE) Sponsorships Module
+
+The Sponsorships module is designed to manage event or project sponsorships. It includes data structures and functions for handling sponsorship configurations and individual sponsorship records.
+
+## Data Structures
+
+### Sponsorship Configuration (`Sponsorship_Cfg`)
+
+This data structure defines the available sponsorship levels, options, and schedules for a particular event or account. It acts as a template for creating individual sponsorships.
+
+### Sponsorship
+
+This represents an actual sponsorship agreement with an organization or individual. It includes details about the sponsor, the selected level, payment amount, and other relevant information.
+
+## Functionality
+
+This module provides the following functionality:
+
+-   **Data Loading:** Functions to load sponsorship configurations and sponsorship records from the backend API.
+-   **Data Export:** A function to download an export of sponsorship data in CSV or Excel format.
+-   **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_sponsorships_functions.ts`: Contains functions for loading and processing sponsorship data.
+-   `db_sponsorships.ts`: Defines the IndexedDB schema for the sponsorships module using Dexie.js.