Add basic documentation setup.

Author: UpstreamData

docs/index.md

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+# gooseBit
+<img src="img/goosebit-logo.png" style="width: 100px; height: 100px; display: block;">
+
+---
+
+A simplistic, opinionated remote update server implementing hawkBit™'s [DDI API](https://eclipse.dev/hawkbit/apis/ddi_api/).
+
+## Setup
+
+To set up, install the dependencies in `pyproject.toml` with `poetry install`.  Then you can run gooseBit by running `main.py`.
+
+## Initial Startup
+
+The first time you start gooseBit, you should change the default username and password inside `settings.yaml`.
+The default login credentials for testing are `admin@goosebit.local`, `admin`.
+
+## Assumptions
+- [SWUpdate](https://swupdate.org) used on device side.
+
+## Current Feature Set
+
+### Firmware repository
+Uploading firmware images through frontend. Accepted file naming patterns are `model_revision_date_time.swu` /
+`model_date_time.swu`. Date and time is used to determine the most current version for a device with a give model
+and revision.
+
+### Automatic device registration
+First time a new device connects, its configuration data is requested. `hw_model` and `hw_revision` are captured from
+the configuration data (both fall back to `default` if not provided) which allows to distinguish different device
+types and their revisions.
+
+### Automatically update device to newest firmware
+Once a device is registered it will get the newest available firmware from the repository based on model and revision.
+
+### Manually update device to specific firmware
+Frontend allows to assign specific firmware to be rolled out.
+
+### Firmware rollout
+Rollouts allow a fine-grained assignment of firmwares to devices. The reported device model and revision is combined
+with the manually set feed and flavor values on a device to determine a matching rollout.
+
+The feed is meant to model either different environments (like: dev, qa, live) or update channels (like. candidate,
+fast, stable).
+
+The flavor can be used for different type of builds (like: debug, prod).
+
+### Pause updates
+Device can be pinned to its current firmware.
+
+### Realtime update logs
+While an update is running, the update logs are captured and visualized in the frontend.

mkdocs.yml

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+site_name: gooseBit
+theme:
+  name: material
+  logo: img/goosebit-logo.svg
+  favicon: img/goosebit-logo.svg