chore: Initial version.

README.md

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+# leggen
+
+An Open Banking CLI.
+
+## Features
+  - Connect to banks using GoCardless Open Banking API
+  - List all connected banks and their status
+  - List balances of all connected accounts
+  - List transactions for an account
+  - Sync all transactions with a MongoDB database
+
+## Installation and Configuration
+
+In order to use `leggen`, you need to create a GoCardless account. GoCardless is a service that provides access to Open Banking APIs. You can create an account at https://gocardless.com/bank-account-data/.
+
+After creating an account and getting your API keys, the best way is to use the [compose file](docker-compose.yml). Open the file and adapt it to your needs. Then run the following command:
+
+```bash
+$ docker-compose up -d
+```
+
+The leggen container will exit, this is expected. Now you can run the following command to create the configuration file:
+
+```bash
+$ docker compose run leggen init
+```
+
+Now you need to connect your bank accounts. Run the following command and follow the instructions:
+
+```bash
+$ docker compose run leggen bank add
+```
+
+To sync all transactions with the database, run the following command:
+
+```bash
+$ docker compose run leggen sync
+```
+
+## Usage
+
+```
+$ leggen --help
+Usage: leggen [OPTIONS] COMMAND [ARGS]...
+
+  Leggen: An Open Banking CLI
+
+Options:
+  --version   Show the version and exit.
+  -h, --help  Show this message and exit.
+
+Command Groups:
+  bank  Manage banks connections
+
+Commands:
+  balances      List balances of all connected accounts
+  init          Create configuration file
+  status        List all connected banks and their status
+  sync          Sync all transactions with database
+  transactions  List transactions for an account
+```
+
+## Caveats
+  - This project is still in early development.