Add initial implementation of Audible Series Checker with API connectors and configuration

readme.md

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+# Audible Series Checker
+
+Audible Series Checker is a Python tool for comparing audiobook series between your ABS library and Audible, helping you track missing tomes and release dates.
+
+## Features
+
+- Connects to ABS and Audible APIs
+- Compares series and book sequences
+- Identifies missing books in your library
+- Supports rate-limited requests and authentication
+- Logs results and errors
+
+## Requirements
+
+See [requirements.txt](requirements.txt) for dependencies. Install with:
+
+```sh
+pip install -r requirements.txt
+```
+
+## Configuration
+
+Copy [.env.example](.env.example) to `.env` and fill in your credentials:
+
+## Usage
+
+Run the main script:
+
+```sh
+python main.py
+```
+
+Logs are written to the `log` file.
+
+## Project Structure
+
+- [main.py](main.py): Entry point and main logic
+- [config.py](config.py): Loads environment variables
+- [connectors/](connectors/): API connectors for ABS, Audible, and AudNexus
+- [requirements.txt](requirements.txt): Python dependencies
+
+## Development
+
+- Mock connectors are available for testing (see `*Mock` classes in [connectors/](connectors/))
+- Logging is configured in [main.py](main.py)
+- Environment variables are loaded via [config.py](config.py)