docs: add Readme

README.md

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+# Trello to Deck
+
+Migrate your Trello Board to Nextcloud Deck.
+
+## Getting Started
+
+- Install `trello-to-deck`:
+
+e.g.
+
+```bash
+cargo install trello-to-deck
+```
+
+- Create a starter configuration file
+
+```bash
+trello-to-deck init
+```
+
+This will create a `trello-to-deck.toml` file in the current directory.
+
+Edit this file to add your Trello and Nextcloud credentials.
+
+### Trello Credentials
+
+To autheniticate to Trello and be able to download the attachements for each card, you need to register a Power Up as a Developer.
+This is free and easy, following these instructions;
+
+- Login to <https://trello.com/>
+- Visit: <https://trello.com/power-ups/admin>
+- Click *New* to create a new Power-Up/Integration
+- Complete the *New Power-Up or Integration* form:
+  - Power-Up or Integrtation Name: *Trello to Deck*
+  - Workspace: select the workspace you went to export your boards from
+  - IFrame: (ignore)
+  - Email: your email
+  - Support: your email
+  - Author: your name
+  - Click *Create*
+- API Key: click *Generate a new API key* (twice)
+- Copy your *API key* into your `trello-to-deck.toml` file
+- To the right of the API Key, click on the *Token* link at the end of the paragraph.
+- On the 'Would you like to give the following application access to your account?' page, scroll down and click *Allow*
+- Copy the token into you `trello-to-deck.toml` file
+
+### Nextcloud Credentials
+
+TODO
+
+### Verify configuration
+
+Run the `check` command to validate your configuration:
+
+```bash
+trello-to-deck check
+```